Closed plunger pump with flushing function

Abstract

A closed plunger pump with a flushing function is characterized in that a flushing valve is additionally arranged at a working oil port of the closed plunger pump, low-pressure-side oil and a shell are communicated through working of the flushing valve, the low-pressure-side oil can continuously return to an oil tank, low-temperature oil is accelerated to be supplemented to a low-pressure-side system, and therefore the normal working temperature of a closed pump system is maintained; and long-time normal output of the system can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, in particular to a closed plunger pump with a flushing function. Background Art

[0002] The existing traditional closed plunger pump does not have a device for cooling the oil in the system, and the system oil temperature is too high, resulting in a decrease in the volumetric efficiency of the closed plunger pump. Summary of the invention

[0003] In view of this, the utility model provides a closed plunger pump with a flushing function.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A closed plunger pump with a flushing function comprises a plunger pump and a flushing valve, the plunger pump comprises a housing and a rear cover, the flushing valve is fixed on the rear cover, a flushing oil passage is provided on the flushing valve, a housing cavity is formed in the housing, a rear cover through hole connecting the housing cavity and the central oil passage of the flushing valve is provided on the rear cover, an oil replenishment pump is arranged on one side of the plunger pump, and the oil replenishment pump is connected to the inside of the rear cover.

[0006] Preferably, a working oil port is provided on the rear cover, and the flushing oil passage includes a central oil passage and a side oil passage formed in the flushing valve, the side oil passages are provided on both sides of the central oil passage, the working oil port is provided corresponding to the side oil passage, the side oil passage is connected with the central oil passage in the working state, and the oil in the side oil passage enters the shell cavity through the central oil passage of the flushing valve and the through hole of the rear cover.

[0007] Preferably, a rear cover through hole is provided between the working oil ports, the rear cover through hole is provided corresponding to the central oil passage, the rear cover through hole is communicated with the central oil passage, and the side oil passage is communicated with the corresponding working oil port.

[0008] Preferably, a valve core assembly is arranged in the flushing valve, and the valve core assembly is symmetrically arranged in the side oil channel. The valve core assembly includes a plug screw, a spring, a spring seat and a valve core body. The spring seat and the valve core body are both arranged in the corresponding side oil channel. A side oil channel opening is provided on the flushing valve, and one end of the plug screw extends into the side oil channel through the side oil channel opening to seal the side oil channel. A spring groove is provided on the end of the plug screw extending into the side oil channel, and one end of the spring extends into the spring groove to abut against the plug screw. The other end of the spring is sleeved on the spring seat, and the end of the spring seat away from the spring abuts against the valve core body.

[0009] Preferably, a rear cover connecting hole is provided on the flush valve, the rear cover connecting holes are symmetrically arranged at both ends of the flush valve, fixing screws are arranged between the rear cover connecting holes and the rear cover, and the flush valve is connected to the rear cover via the fixing screws.

[0010] Preferably, a transmission shaft is arranged in the housing, the oil replenishment pump is arranged on a side of the piston pump close to the rear cover, and the oil replenishment pump is sleeved on the transmission shaft.

[0011] Preferably, the flushing valve is arranged on the side of the rear cover, a plug installation port is provided on the flushing valve, the plug installation port is connected to the flushing oil channel and the outside of the flushing valve, and a sealing plug is arranged in the plug installation port.

[0012] The beneficial effect of the utility model is that by adding a flushing valve at the working oil port of the closed plunger pump, the low-pressure side oil and the shell are connected through the operation of the flushing valve, so that the low-pressure side oil can continuously return to the oil tank through the shell cavity, and the oil replenishment pump is accelerated to replenish the low-temperature oil from the oil tank to the low-pressure side system, thereby achieving the closed pump system to maintain a normal working temperature and ensuring that the system can output normally for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Attached Figure 1 It is a schematic diagram of the structure of a plunger pump;

[0015] Attached Figure 2 This is a schematic diagram of the interior of a plunger pump;

[0016] Attached Figure 3 This is a schematic diagram of the interior of the flushing valve;

[0017] Attached Figure 4 This is a schematic diagram of the installation surface of the plunger pump and flushing valve (side view of the rear cover). DETAILED DESCRIPTION

[0018] 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 in 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.

[0019] The utility model will be further described below in conjunction with the accompanying drawings of the specification.

[0020] The utility model provides the following technical solutions:

[0021] As attached Figure 1-4 As shown, the utility model discloses a closed plunger pump 1 with flushing function, including a plunger pump 1 and a flushing valve 3, the plunger pump 1 including a housing 2 and a rear cover 4, the flushing valve 3 is fixed on the rear cover 4, a flushing valve working oil passage 5 (10) is provided on the flushing valve 3, a housing cavity 6 is formed in the housing 2, a rear cover through hole 11 connecting the housing cavity 6 and the flushing valve central oil passage 9 is provided on the rear cover 4, and an oil replenishment pump 8 is arranged on one side of the plunger pump 1, and the oil replenishment pump 8 is connected with the inside of the housing. Specifically, in the present design, by adding a flushing valve 3 at the working oil port 7 on the closed plunger pump 1, the low-pressure side oil and the housing are connected through the operation of the flushing valve 3, so that the low-pressure side oil can continuously return to the oil tank through the housing cavity, and the replenishing pump is accelerated to suck low-temperature oil from the oil tank to replenish the low-pressure side system, so that the closed pump system can maintain a normal working temperature and ensure that the system can output normally for a long time.

[0022] Furthermore, the flushing oil passage includes a central oil passage 9 and a side oil passage 5 (10) formed in the flushing valve 3, the side oil passages 5 (10) are arranged on both sides of the central oil passage 9, and the working oil port 7 is arranged corresponding to the side oil passage 5 (10). Specifically, in the present embodiment, the working oil ports 24 and 25 on the rear cover are arranged corresponding to the side oil passage 2 10 and the side oil passage 1 5, respectively, a rear cover through hole 11 is arranged between the working oil ports 7, the rear cover through hole 11 is arranged corresponding to the central oil passage 9, the rear cover through hole 11 is connected with the central oil passage 9, the side oil passages 5 and 10 are connected with the corresponding working oil ports 25 and 24, respectively, and when the side oil passage is connected with the central oil passage, the oil in the side oil passage of the rear cover enters the housing cavity through the central oil passage of the flushing valve and the rear cover through hole on the rear cover.

[0023] Furthermore, a valve core assembly 17 is arranged in the flushing valve 3, and the valve core assembly 17 is symmetrically arranged in the side oil channel 10. The valve core assembly 17 includes a plug screw 18, a spring 19, a spring seat 20 and a valve core body 21. The spring seat 20 and the valve core body 21 are both arranged in the corresponding side oil channel 10. A side oil channel opening 22 is provided on the flushing valve 3, and one end of the plug screw 18 extends into the side oil channel 10 through the side oil channel opening 22 to seal the side oil channel 10. A spring groove 23 is provided on the end of the plug screw 18 extending into the side oil channel 10, and one end of the spring 19 extends into the spring groove 23 to resist the plug screw 18. The other end of the spring 19 is sleeved on the spring seat 20, and the end of the spring seat 20 away from the spring 19 resists the valve core body 21. Specifically, in this embodiment, when the plunger pump is in working state, the oil at the high-pressure side oil port 25 enters the flushing valve spring groove 23 through the side oil channel 15 and the side groove 26 on the valve core 21, pushing the valve core body to one side, so that the side oil channel 10 is connected with the center oil channel 9, and at the same time the working oil port 24 is connected with the rear cover through hole 11, and then connected to the inside of the shell 2, so that the oil at the low-pressure side oil port 24 returns to the shell 2 and returns to the oil tank from the oil drain port.

[0024] Furthermore, the flushing valve 3 is provided with a rear cover connection hole 12, the rear cover connection holes 12 are symmetrically arranged at both ends of the flushing valve 3, a fixing screw 13 is arranged between the rear cover connection hole 12 and the rear cover 4, and the flushing valve 3 is connected to the rear cover 4 through the fixing screw 13. Specifically, in this embodiment, by using the fixing screw 13 to install the flushing valve 3 on the rear cover 4, and the fixing screw 13 is arranged at both ends of the flushing valve 3, the connection strength and structural stability between the flushing valve 3 and the rear cover 4 can be ensured, and the loosening phenomenon of the flushing valve 3 during the flow of oil can be prevented.

[0025] Furthermore, a transmission shaft 14 is disposed in the housing 2 , and the oil replenishment pump 8 is disposed on a side of the plunger pump 1 close to the rear cover 4 , and the oil replenishment pump 8 is sleeved on the transmission shaft 14 .

[0026] Furthermore, the flushing valve 3 is arranged on the side of the rear cover 4, and a plug installation port 15 is opened on the flushing valve 3. The plug installation port 15 is connected to the side oil channel 5 (10) and the outside of the flushing valve 3, and a sealing plug 16 is arranged in the plug installation port 15.

[0027] Specifically, in the present design, the flushing valve 3 is fixed to the rear cover 4 of the plunger pump 1 by two hexagon socket screws, and the side oil passages 5 (10) on both sides of the flushing valve 3 are connected to the working oil port 7 on the rear cover 4. The rear cover through hole 11 on the rear cover 4 connects the inner cavity of the housing 2 with the central oil passage 9 on the flushing valve 3. After the plunger pump 1 starts to work, the high-pressure side oil pushes the valve core in the flushing valve 3, so that the working oil port 7 (i.e., the low-pressure oil port 24) on the rear cover is connected to the central oil passage 9 of the flushing valve 3. The low-pressure side oil flows into the inner cavity of the housing 2 through the central oil passage 9 and the rear cover through hole 11 on the rear cover 4, and returns to the oil tank through the oil drain port. On the other hand, the low-pressure side of the plunger pump 1 is continuously replenished with oil by the oil replenishing pump 8, and the oil with a lower temperature in the oil tank is replenished to the low-pressure side, neutralizing the internal oil temperature, so that the internal oil temperature of the plunger pump 1 is reduced, thereby achieving the effect of cooling the oil of the plunger pump 1.

[0028] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A closed plunger pump with flushing function, characterized in that: It includes a plunger pump and a flushing valve, the plunger pump includes a shell and a rear cover, the flushing valve is fixed on the rear cover, a flushing oil channel is arranged on the flushing valve, a shell cavity is formed in the shell, a rear cover through hole connecting the shell cavity and the flushing valve is arranged on the rear cover, an oil replenishing pump is arranged on one side of the plunger pump, and the oil replenishing pump is connected with the inside of the rear cover.

2. The closed plunger pump with flushing function according to claim 1, characterized in that: A working oil port is arranged on the rear cover, and the flushing oil passage includes a central oil passage and a side oil passage formed in the flushing valve. The side oil passages are arranged on both sides of the central oil passage, and the working oil port is arranged corresponding to the side oil passage. The side oil passage is connected with the central oil passage in the working state, and the oil in the side oil passage enters the shell cavity through the central oil passage of the flushing valve and the through hole of the rear cover.

3. The closed plunger pump with flushing function according to claim 2, characterized in that: A rear cover through hole is arranged between the working oil ports, the rear cover through hole is arranged corresponding to the central oil passage, the rear cover through hole is communicated with the central oil passage, and the side oil passage is communicated with the corresponding working oil port.

4. The closed plunger pump with flushing function according to claim 2, characterized in that: A valve core assembly is arranged in the flushing valve, and the valve core assembly is symmetrically arranged in the side oil channel. The valve core assembly includes a screw plug, a spring, a spring seat and a valve core body. The spring seat and the valve core body are both arranged in the corresponding side oil channel. A side oil channel opening is arranged on the flushing valve, and one end of the screw plug extends into the side oil channel through the side oil channel opening to seal the side oil channel. A spring groove is arranged on the end of the screw plug extending into the side oil channel, and one end of the spring extends into the spring groove to abut against the screw plug. The other end of the spring is sleeved on the spring seat, and the end of the spring seat away from the spring abuts against the valve core body.

5. The closed plunger pump with flushing function according to claim 1, characterized in that: The flush valve is provided with a rear cover connection hole, the rear cover connection holes are symmetrically arranged at both ends of the flush valve, fixing screws are arranged between the rear cover connection holes and the rear cover, and the flush valve is connected to the rear cover through the fixing screws.

6. The closed plunger pump with flushing function according to claim 1, characterized in that: A transmission shaft is arranged in the housing, the oil replenishment pump is arranged on a side of the plunger pump close to the rear cover, and the oil replenishment pump is sleeved on the transmission shaft.

7. The closed plunger pump with flushing function according to claim 3, characterized in that: The flushing valve is arranged on the side of the rear cover, a plug installation port is provided on the flushing valve, the plug installation port is connected with the flushing oil passage and the outside of the flushing valve, and a sealing plug is arranged in the plug installation port.

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