Pump head leaked liquid backflow structure of plunger metering pump

Abstract

The utility model relates to a plunger metering pump head leaked liquid backflow structure which comprises a pump head, a liquid inlet pipe and a liquid outlet pipe which are arranged on the pump head, a working cavity arranged on the pump head and a plunger, the plunger is connected in the working cavity in a sliding mode, the liquid inlet pipe and the liquid outlet pipe are both communicated with the working cavity, the pump head is provided with a sealing cavity communicated with the working cavity, and the sealing cavity is communicated with the working cavity. A plurality of first leakage-proof assemblies are arranged in the sealing cavity, are sequentially arranged in the sliding direction of the plunger and are connected with one another, and each first leakage-proof assembly comprises a first sealing piece and a first sealing space ring which are connected with one another; a first sealing locking cap is arranged on the pump head and used for pressing the multiple sets of first leakage-proof assemblies into the sealing cavity in an abutting mode. The plunger penetrates through the first sealing locking cap and the multiple sets of first leakage-proof assemblies, and the multiple first sealing pieces are all in sealing fit with the plunger. The liquid leakage prevention performance of the pump head is improved by arranging a double-sealing structure and a leaked liquid backflow structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of water pump especially is involved in a plunger metering pump pump head leak backflow structure. BACKGROUND

[0002] Metering pump completes the quantitative pumping of liquid through the reciprocating motion of plunger, but part of liquid will leak to the outside through the connecting place of pump head and plunger in the process of reciprocating motion of plunger. SUMMARY

[0003] The application provides a plunger metering pump pump head leak backflow structure, which is provided with double sealing structures and a leak backflow structure to improve the leakproof performance of the pump head.

[0004] The plunger metering pump pump head leak backflow structure provided by the application adopts the following technical scheme:

[0005] A plunger metering pump pump head leak backflow structure, comprising a pump head, a liquid inlet pipe and a liquid outlet pipe arranged on the pump head, a working cavity arranged on the pump head, and a plunger, wherein the plunger is slidably connected in the working cavity, the liquid inlet pipe and the liquid outlet pipe are both connected to the working cavity, the pump head is provided with a sealing cavity connected to the working cavity, a plurality of first leakproof assemblies are arranged in the sealing cavity, the plurality of first leakproof assemblies are arranged in sequence along the sliding direction of the plunger and are connected to each other, and each first leakproof assembly comprises a first sealing member and a first sealing spacer connected to each other; the pump head is provided with a first sealing locking cap, the first sealing locking cap is used for pressing the plurality of first leakproof assemblies in the sealing cavity; the plunger passes through the first sealing locking cap and the plurality of first leakproof assemblies, and each first sealing member is in sealing cooperation with the plunger.

[0006] By adopting the above technical scheme, the plurality of first leakproof assemblies are arranged to prevent the liquid in the working cavity from leaking to the outside when the plunger moves.

[0007] Preferably, the first sealing member is a high-density graphite tetrafluoro shaft sleeve.

[0008] By adopting the above technical scheme, the high-density graphite tetrafluoro shaft sleeve has excellent lubricating effect, and the cooperation of the high-density graphite tetrafluoro shaft sleeve and the plunger can not only meet the sealing requirement but also reduce the friction between the plunger and the high-density graphite tetrafluoro shaft sleeve, thereby reducing the wear of the plunger to a certain extent and improving the overall service life of the metering pump.

[0009] Preferably, a first ring groove is formed in the first sealing member, and a plug is arranged on the first sealing spacer and in plug-in cooperation with the first ring groove.

[0010] By adopting the above technical scheme, the first sealing member and the first sealing spacer are conveniently connected and cooperated.

[0011] Preferably, the first sealing member is provided with a second annular groove, and the first annular groove is arranged on the bottom wall of the second annular groove, and the opening of the first annular groove is larger than the bottom of the first annular groove.

[0012] By using the above technical scheme, the plug is conveniently inserted into the first annular groove.

[0013] Preferably, the pump head is provided with a backflow channel, the pump head is provided with a backflow pipe communicating with the backflow channel and the liquid inlet pipe, the first sealing locking cap is provided with an avoiding channel for the plunger to pass through, and the first sealing locking cap is provided with a communicating hole communicating the backflow channel and the avoiding channel.

[0014] By using the above technical scheme, if a small amount of liquid leaks into the avoiding channel due to the reciprocating movement of the plunger, the liquid can be backflowed into the liquid inlet pipe through the communicating hole and the backflow pipe, thereby preventing the liquid from leaking out of the pump head.

[0015] Preferably, the first sealing locking cap is provided with a second leakage prevention assembly, the second leakage prevention assembly comprises a second sealing member and a second sealing spacer connected with each other, the first sealing locking cap is further provided with a second sealing locking cap, the second sealing locking cap is used for pressing the second leakage prevention assembly against the first sealing locking cap, the plunger passes through the second leakage prevention assembly and the second sealing locking cap, and the second sealing member is in sealing cooperation with the plunger.

[0016] By using the above technical scheme, the liquid is prevented from leaking out of the connection between the plunger and the first sealing locking cap.

[0017] Preferably, the second sealing member is a low-density graphite tetrafluoride shaft sleeve.

[0018] By using the above technical scheme, the low-density graphite tetrafluoride shaft sleeve has sufficient sealing performance and is cheaper than the high-density graphite tetrafluoride shaft sleeve, so that the sealing performance is ensured and the cost is reduced.

[0019] The technical effects of the utility model mainly lie in the following aspects:

[0020] 1. The double sealing structure is arranged to ensure the sealing performance of the pump head.

[0021] 2. The backflow structure of the pump head is arranged to prevent the liquid from leaking.

[0022] 3. The appropriate cooperation piece is used to improve the sealing performance and service life of the pump body. DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the product of the application.

[0024] Figure 2is Figure 1 A local enlarged view at the middle of A.

[0025] Reference numerals: 1, pump head; 11, working cavity; 12, sealing cavity; 13, backflow channel; 14, backflow pipe; 2, liquid inlet pipe; 3, liquid outlet pipe; 4, plunger; 5, first leak-proof assembly; 51, first sealing member; 511, first annular groove; 512, second annular groove; 52, first sealing spacer; 521, insertion block; 6, first sealing locking cap; 61, avoiding passage; 62, communication hole; 7, second leak-proof assembly; 71, second sealing member; 72, second sealing spacer; 8, second sealing locking cap. DETAILED DESCRIPTION

[0026] The following will be described in detail in combination with the accompanying drawings to make the technical scheme of the present application easier to understand and grasp. Figure 1 and the accompanying drawings Figure 2 The present application will be further described in detail to make the technical scheme of the present application easier to understand and grasp.

[0027] The leak-back structure of the plunger 4 metering pump head 1 of the embodiment comprises the pump head 1, the liquid inlet pipe 2 and the liquid outlet pipe 3 installed on the pump head 1, the working cavity 11 provided on the pump head 1, and the plunger 4. The plunger 4 is slidably connected in the working cavity 11, and the liquid inlet pipe 2 and the liquid outlet pipe 3 are both communicated with the working cavity 11.

[0028] The pump head 1 is provided with the sealing cavity 12 communicated with the working cavity 11, and two groups of first leak-proof assemblies 5 are arranged in the sealing cavity 12. The two groups of first leak-proof assemblies 5 are arranged in sequence along the sliding direction of the plunger 4 and are connected with each other. The first leak-proof assembly 5 comprises the first sealing member 51 and the first sealing spacer 52 which are connected with each other. The first sealing member 51 is a high-density graphite tetrafluoro shaft sleeve.

[0029] The first sealing member 51 is provided with the second annular groove 512, and the opening of the first annular groove 511 is larger than the bottom of the first annular groove 511. The bottom wall of the second annular groove 512 is provided with the first annular groove 511. The first sealing spacer 52 is provided with the insertion block 521 which is inserted and matched with the first annular groove 511.

[0030] The pump head 1 is further provided with the first sealing locking cap 6 which is used to press the two groups of first leak-proof assemblies 5 in the sealing cavity 12. The first sealing locking cap 6 is provided with the avoiding passage 61 through which the plunger 4 passes. The plunger 4 passes through the avoiding passage 61, the two first sealing members 51 and the two first sealing spacers 52 and then extends into the working cavity 11. The two first sealing members 51 are both in sealing cooperation with the plunger 4.

[0031] The use of the high-density graphite tetrafluoro shaft sleeve as the first sealing member 51 in cooperation with the plunger 4 can not only meet the sealing requirement but also reduce the friction between the plunger 4 and the first sealing member 51, thereby reducing the wear of the plunger 4 to a certain extent and improving the overall service life of the metering pump.

[0032] The pump head 1 is provided with a backflow channel 13, and the pump head 1 is provided with a backflow pipe 14 which communicates with the backflow channel 13 and the liquid inlet pipe 2. The first sealing and locking cap 6 is provided with a communication hole 62 which communicates with the backflow channel 13 and the avoiding channel 61. If a small amount of liquid leaks into the avoiding channel 61 due to the reciprocating movement of the plunger 4, the liquid will flow back into the liquid inlet pipe 2 through the communication hole 62 and the backflow pipe 14, thereby preventing the liquid from leaking out of the pump head 1.

[0033] The first sealing and locking cap 6 is provided with a second leakage prevention assembly 7 which comprises a second sealing member 71 and a second sealing spacer 72 which are connected to each other, and the second sealing member 71 is a low-density graphite four-fluorine shaft sleeve. The first sealing and locking cap 6 is further provided with a second sealing and locking cap 8 which is used to press the second leakage prevention assembly 7 against the first sealing and locking cap 6. The plunger 4 extends into the avoiding channel 61 after passing through the second sealing and locking cap 8, the second sealing member 71 and the second sealing spacer 72, and the second sealing member 71 is in sealing cooperation with the plunger 4.

[0034] Of course, the above is only a typical example of the present application, and in addition to this, the present application can have other various specific embodiments, and any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the scope of the present application.

Claims

1. A leakage backflow structure of a plunger metering pump head, comprising a pump head (1), an inlet pipe (2) and an outlet pipe (3) arranged on the pump head (1), a working chamber (11) arranged on the pump head (1), and a plunger (4) slidingly connected in the working chamber (11), wherein the inlet pipe (2) and the outlet pipe (3) are both communicated with the working chamber (11), characterized in that: The pump head (1) is provided with a sealed cavity (12) communicated with the working cavity (11), a plurality of first leakage prevention assemblies (5) are arranged in the sealed cavity (12) and are sequentially arranged and connected with each other along the sliding direction of the plunger (4), the first leakage prevention assembly (5) comprises a first sealing member (51) and a first sealing spacer (52) which are connected with each other, the pump head (1) is provided with a first sealing locking cap (6), the first sealing locking cap (6) is used for pressing the plurality of first leakage prevention assemblies (5) in the sealed cavity (12), and the plunger (4) penetrates through the first sealing locking cap (6) and the plurality of first leakage prevention assemblies (5), and the plurality of first sealing members (51) are in sealing cooperation with the plunger (4). ​ 2. A liquid leakage return structure for a plunger metering pump head according to claim 1, characterized in that: The first sealing member (51) is a high-density graphite tetrafluoro shaft sleeve.

3. A liquid leakage return structure for a plunger metering pump head according to claim 1, characterized in that: The first sealing member (51) is provided with a first ring groove (511), and the first sealing spacer (52) is provided with an insertion block (521) in plug-in cooperation with the first ring groove (511).

4. A liquid leakage return structure for a plunger metering pump head according to claim 3, characterized in that: The first sealing member (51) is provided with a second ring groove (512), the first ring groove (511) is arranged on the bottom wall of the second ring groove (512), and the slot opening of the first ring groove (511) is larger than the groove bottom of the first ring groove (511).

5. A liquid leakage return structure for a plunger metering pump head according to claim 1, characterized in that: The pump head (1) is provided with a backflow channel (13), the pump head (1) is provided with a backflow pipe (14) communicated with the backflow channel (13) and the liquid inlet pipe (2), the first sealing locking cap (6) is provided with an avoidance channel (61) for the plunger (4) to penetrate through, the first sealing locking cap (6) is provided with a communication hole (62), and the communication hole (62) is communicated with the backflow channel (13) and the avoidance channel (61).

6. A liquid leakage return structure for a plunger metering pump head according to claim 1, characterized in that: The first sealing locking cap (6) is provided with a second leakage prevention assembly (7), the second leakage prevention assembly (7) comprises a second sealing member (71) and a second sealing spacer (72) which are connected with each other, the first sealing locking cap (6) is further provided with a second sealing locking cap (8), the second sealing locking cap (8) is used for pressing the second leakage prevention assembly (7) on the first sealing locking cap (6), the plunger (4) penetrates through the second leakage prevention assembly (7) and the second sealing locking cap (8), and the second sealing member (71) is in sealing cooperation with the plunger (4).

7. A liquid leakage return structure for a plunger metering pump head according to claim 6, characterized in that: The second sealing member (71) is a low-density graphite tetrafluoro shaft sleeve.

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