Ultrahigh-pressure fluoroplastic infusion pump

Abstract

The utility model discloses an ultrahigh pressure fluoroplastic infusion pump which comprises a pump body unit, and the pump body unit is provided with at least one pump body liquid inlet and at least one pump body liquid outlet. The pump body unit comprises a pump body, a pump body lining, a plunger rod assembly, a lower one-way valve body, a lower one-way valve lining, an upper one-way valve body, an upper one-way valve lining, a liquid inlet one-way valve and a liquid outlet one-way valve. Compared with an existing high-pressure fluoroplastic infusion pump, the high-pressure fluoroplastic infusion pump has the advantages that the working pressure is higher, the range of conveyed medium types is wider, the defects of the high-pressure fluoroplastic infusion pump in the prior art in the aspects of the working pressure and the conveyed medium types are well overcome, and the high-pressure fluoroplastic infusion pump is wider in application range and higher in reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid conveying equipment, in particular to an ultra-high pressure fluoroplastic infusion pump. Background Art

[0002] High-pressure fluoroplastic infusion pumps have the advantages of corrosion resistance, high flow accuracy, high delivery pressure, and smooth pulses. They are mainly suitable for chemical feeding, reactant addition, catalyst addition, supercritical fluid delivery, foaming extrusion process, new energy research, chip semiconductors, catalytic refining kettle reactions, etc. Existing high-pressure fluoroplastic infusion pumps have the following problems:

[0003] 1. The maximum delivery pressure that the existing high-pressure fluoroplastic infusion pump can withstand is 5MPa, which cannot meet the requirements of ultra-high pressure working conditions;

[0004] 2. The sealing ring used in the existing high-pressure fluoroplastic infusion pump is mainly a pan-seal, which is a high-performance seal with a special metal spring inside. Although the pan-seal has excellent high-pressure resistance, the spring installed inside is made of metal. When conveying corrosive media that the metal material cannot withstand, the metal spring inside the pan-seal will be corroded. Therefore, the pan-seal has certain limitations on the types of media that can be conveyed;

[0005] 3. When the existing high-pressure fluoroplastic infusion pump is conveying complex media, due to the different density and concentration of the media, the valve ball of the one-way valve of the existing high-pressure fluoroplastic infusion pump cannot be reset in time and accurately, so that the valve ball and valve seat cannot be closed normally and tightly, causing one-way valve failure. Therefore, the one-way valve of the existing fluoroplastic infusion pump has certain limitations on the types of media that can be conveyed;

[0006] 4. When the existing high-pressure fluoroplastic infusion pump is equipped with a sensor unit, the sensor unit of the existing high-pressure fluoroplastic infusion pump is easily deformed or even broken due to the limitation of the performance of the fluoroplastic material. The sensor unit may be damaged after working for a long time due to the high working pressure.

[0007] Therefore, the applicant has found a solution to the above-mentioned problem through beneficial exploration and research, and the technical solution to be introduced below is produced in this context. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide an ultra-high pressure fluoroplastic infusion pump which can stably transport different media under ultra-high pressure conditions in view of the deficiencies of the prior art.

[0009] The technical problem to be solved by the present invention can be achieved by adopting the following technical solutions:

[0010] An ultra-high pressure fluoroplastic infusion pump, comprising a pump body unit, wherein the pump body unit has at least one pump body liquid inlet and at least one pump body liquid outlet; the pump body unit comprises:

[0011] A pump body, wherein at least one pump chamber is formed in the pump body;

[0012] A pump body liner is arranged in each pump cavity of the pump body, wherein a liner flow channel is formed in the pump body liner;

[0013] A plunger rod assembly is arranged in the lining of each pump body, a sealing ring assembly is coaxially arranged on the outer peripheral surface of the front end of the plunger rod assembly and is slidably sealed with the plunger rod assembly, and the front end of the plunger rod assembly coaxially passes through the sealing ring assembly and then extends into the lining of the pump body;

[0014] A lower one-way valve body installed on the bottom surface of the pump body, wherein the lower one-way valve body is provided with at least one lower one-way valve body liquid inlet, and the lower one-way valve body liquid inlet serves as a pump body liquid inlet of the pump body unit;

[0015] A lower one-way valve liner installed in the lower one-way valve body, wherein the lower one-way valve liner is provided with a liquid inlet channel, and one end of the liquid inlet channel is connected to a lower one-way valve body liquid inlet port of the lower one-way valve body;

[0016] An upper one-way valve body installed on the top surface of the pump body, wherein the upper one-way valve body is provided with at least one upper one-way valve body liquid outlet, and the upper one-way valve body liquid outlet serves as a pump body liquid outlet of the pump body unit;

[0017] An upper one-way valve liner is arranged in the upper one-way valve body, wherein a liquid outlet flow channel is formed in the upper one-way valve liner, and one end of the liquid outlet flow channel is communicated with the upper one-way valve body liquid outlet of the upper one-way valve body;

[0018] a liquid inlet check valve installed in the pump body and located between the lower check valve liner and each pump body liner, wherein the liquid inlet end of the liquid inlet check valve is communicated with the liquid inlet flow channel of the lower check valve liner, and the liquid outlet end of the liquid inlet check valve is communicated with the liquid inlet end of the liner flow channel of the corresponding pump body liner; and

[0019] A liquid outlet one-way valve is installed in the pump body and located between the upper one-way valve lining and each pump body lining, wherein the liquid inlet end of the liquid outlet one-way valve is connected to the liquid outlet end of the lining flow channel of the corresponding pump body lining, and the liquid outlet end of the liquid outlet valve is connected to the liquid outlet flow channel of the upper one-way valve lining.

[0020] In a preferred embodiment of the utility model, the pump body lining, the upper one-way valve lining and the lower one-way valve lining are made of non-metallic materials, and the pump body, the lower one-way valve body and the upper one-way valve body are made of metallic materials.

[0021] In a preferred embodiment of the present invention, the non-metallic material is fluoroplastic, and the metal material is one of stainless steel, carbon steel or alloy steel.

[0022] In a preferred embodiment of the present utility model, the liquid inlet check valve and / or the liquid outlet check valve comprises:

[0023] A valve body, wherein the upper and lower end surfaces of the valve body are open structures and a valve cavity is formed therein;

[0024] An upper valve cover is arranged on the upper end surface of the valve body, and at least one upper valve cover through hole communicating with the valve cavity is opened in the upper valve cover;

[0025] A lower valve cover is arranged on the lower end surface of the valve body, and at least one lower valve cover through hole communicating with the valve cavity is opened in the lower valve cover;

[0026] At least two valve sleeves are axially spaced apart and arranged in the valve cavity of the valve body, each valve sleeve forming a valve sleeve cavity;

[0027] An isolation sleeve disposed in the valve cavity of the valve body and between two adjacent valve sleeves for isolating the two adjacent valve sleeves;

[0028] a valve seat mounted in each valve sleeve and located at the lower end of the valve sleeve cavity thereof; and

[0029] A valve ball is installed in each valve sleeve.

[0030] In a preferred embodiment of the present utility model, the sealing ring assembly includes a sealing ring body, a sealing ring spring and a sealing ring cover. The sealing ring body is installed on the end of a preset step channel lining the pump body and is sleeved on the plunger rod of the plunger rod assembly, and an annular groove is formed on the front end surface thereof. The sealing ring spring is arranged in the annular groove of the sealing ring body. The sealing ring cover is installed on the front end surface of the sealing ring body, and is used to seal the sealing ring spring in the annular groove of the sealing ring body.

[0031] In a preferred embodiment of the utility model, it also includes a sensor unit with a pressure monitoring function, the sensor unit has at least one sensor liquid inlet and at least one sensor liquid outlet, and the sensor liquid inlet of the sensor unit is correspondingly connected to the pump body liquid outlet of the pump body unit.

[0032] In a preferred embodiment of the present utility model, the sensor unit includes a sensor housing, a sensor liner, a pressure sensor, a sensor sealing gasket, a sensor pressure cap and a vent valve, at least one sensor liquid inlet and a sensor liquid outlet are formed on the surface of the sensor housing, the sensor liner is installed in the sensor housing, the sensor liner forms a liquid collecting cavity, the liquid collecting cavity is respectively connected to each sensor liquid inlet and sensor liquid outlet, the pressure sensor is installed on the sensor housing through the sensor pressure cap and is located in the sensor liner, the vent valve is installed on the sensor housing and extends into the liquid collecting cavity of the sensor liner, and the sensor sealing gasket is installed between the sensor liner and the pressure sensor.

[0033] In a preferred embodiment of the present utility model, the sensor housing is made of stainless steel, carbon steel or alloy steel, and the sensor lining is made of fluoroplastic.

[0034] In a preferred embodiment of the utility model, the pump body outlet of the pump body unit and the sensor liquid inlet of the sensor unit are connected by a pump body infusion tube, the sensor liquid outlet of the sensor unit is connected with an outlet tube, and the pump body infusion tube and the pump body outlet, the pump body infusion tube and the sensor liquid inlet, and the outlet tube and the sensor liquid outlet are all connected and fixed by a pipe joint assembly.

[0035] In a preferred embodiment of the utility model, the pipe joint assembly includes a spindle-shaped sealing gasket and a fixing screw, the spindle-shaped sealing gasket is slidably mounted on the pump body infusion tube or the outlet tube, and the fixing screw is slidably mounted on the pump body infusion tube or the outlet tube and is located on the outside of the spindle-shaped sealing gasket; during installation, the end of the pump body infusion tube or the outlet tube is first inserted into the pump body outlet, the sensor inlet or the sensor outlet, and then the fixing screw is screwed into the pump body outlet, the sensor inlet or the sensor outlet to press the spindle-shaped sealing gasket against the inner side surface of the pump body outlet, the sensor inlet or the sensor outlet, and the spindle-shaped sealing gasket is deformed under the mutual compression of the conical surfaces of the fixing screw and the bottom surface of the mounting hole, so that the conical surfaces on both sides of the spindle-shaped sealing gasket lock the outer tube surface of the pump body infusion tube or the outlet tube.

[0036] Due to the adoption of the above technical scheme, the beneficial effect of the utility model is that compared with the existing high-pressure fluoroplastic infusion pump, the utility model has a higher working pressure and a wider range of medium types, which makes up for the shortcomings of the existing high-pressure fluoroplastic infusion pump in terms of working pressure and types of conveyed media, and has a wider application range and higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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.

[0038] Figure 1 It is a structural schematic diagram of an ultra-high pressure fluoroplastic infusion pump of the utility model.

[0039] Figure 2 It is a longitudinal sectional view of the pump body unit of the utility model.

[0040] Figure 3 It is a structural schematic diagram of the sealing ring assembly of the utility model.

[0041] Figure 4 It is a structural schematic diagram of an embodiment of the liquid inlet one-way valve or the liquid outlet one-way valve of the utility model.

[0042] Figure 5 It is a structural schematic diagram of the sensor unit of the utility model.

[0043] Figure 6 yes Figure 5 AA section view.

[0044] Figure 7 It is a structural schematic diagram of a pipe joint assembly of the utility model. DETAILED DESCRIPTION

[0045] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0046] See also Figure 1 , the figure shows an ultra-high pressure fluoroplastic infusion pump, including a pump body unit 100 and a sensor unit 200. The pump body unit 100 has a pump body liquid inlet 101 and two pump body liquid outlets 102. Of course, the pump body liquid inlet and pump body liquid outlet in the pump body unit 100 are not limited to the number in this embodiment, and are set according to the design requirements of the infusion pump.

[0047] The sensor unit 200 has a pressure monitoring function, and has two sensor liquid inlets 201 and one sensor liquid outlet 202. The two sensor liquid inlets of the sensor unit 200 are correspondingly connected to the two pump body liquid outlets of the pump body unit 100. Of course, the number of sensor liquid inlets and sensor liquid outlets in the sensor unit 200 is not limited to that in this embodiment, and it should be matched with the pump body unit 100.

[0048] See also Figure 2 , the figure shows a schematic diagram of the structure of a specific embodiment of the pump body unit, and the pump body unit 100 includes a pump body 110, a pump body liner 120a, 120b, a plunger rod assembly 130a, 130b, a lower one-way valve body 140, a lower one-way valve liner 150, an upper one-way valve body 160, an upper one-way valve liner 170, an inlet one-way valve 180a, 180b and an outlet one-way valve 190a, 190b. Of course, the pump body liner, the plunger rod assembly, the inlet one-way valve and the outlet one-way valve are not limited to the number in this embodiment, and they should be set according to the number of infusion channels in the pump body unit. In this embodiment, two infusion channels are set in the pump body unit, so the matching pump body liner, the plunger rod assembly, the inlet one-way valve and the outlet one-way valve are also set to two. Of course, the infusion flow channel in the pump unit can also be set to one or three or more, and the matching pump body lining, plunger rod assembly, liquid inlet check valve and liquid outlet check valve should also be adaptively adjusted.

[0049] Pump chambers 111a and 111b are formed in the pump body 110. Pump body liners 120a and 120b are disposed in the pump chambers 111a and 111b of the pump body 110, and liner flow channels 121a and 121b are formed in the pump body liners 120a and 120b.

[0050] The plunger rod assemblies 130a, 130b are disposed within the pump body liners 120a, 120b. Figure 3 A sealing ring assembly 400 is coaxially arranged on the outer circumferential surface of the front end of the plunger rod assembly 130a, 130b, and the front end of the plunger rod assembly 130a, 130b coaxially passes through the sealing ring assembly 400 and extends into the pump body liner 120a, 120b. Specifically, the sealing ring assembly 400 includes a sealing ring body 410, a sealing ring spring 420 and a sealing ring cover 430. The sealing ring body 410 is installed on the end of the preset step channel of the pump body liner 120a or the pump body liner 120b and is sleeved on the plunger rod 131a of the plunger rod assembly 130a or the plunger rod 131b of the plunger rod assembly 130b, and an annular groove 411 is formed on its front end surface. The sealing ring spring 420 is arranged in the annular groove 411 of the sealing ring body 410. The sealing ring cover 430 is installed on the front end surface of the sealing ring body 410, and is used to seal the sealing ring spring 420 in the annular groove 411 of the sealing ring body 410. The sealing ring assembly 400 adopts a closed installation structure, so that the sealing ring spring 420 does not contact the medium to be transported, solving the problem of the front sealing ring of the traditional fluoroplastic infusion pump limiting the types of transportable media.

[0051] The lower check valve body 140 is installed on the bottom surface of the pump body 110, and a liquid inlet 141 serving as the pump body liquid inlet 101 of the pump body unit 100 is provided on the side surface of the pump body 110. The lower check valve liner 150 is installed in the lower check valve body 140, and a liquid inlet flow channel 151 is formed in the lower check valve liner 150, and one end of the liquid inlet flow channel 151 is communicated with the liquid inlet 141 of the lower check valve body 140.

[0052] The upper check valve body 160 is mounted on the top surface of the pump body 110, and the side surface of the upper check valve body 160 is provided with liquid outlets 161a and 161b serving as the pump body liquid outlet 102 of the pump body unit 100. The upper check valve liner 170 is disposed in the upper check valve body 160, and liquid outlet channels 171a and 171b are formed in the upper check valve liner 170, and one end of the liquid outlet channels 171a and 171b is communicated with one end of the liquid outlets 161a and 161b.

[0053] The liquid inlet check valves 180a and 180b are installed in the pump body 110 and are located between the lower check valve liner 150 and the pump body liners 120a and 120b. The liquid inlet ends of the liquid inlet check valves 180a and 180b are communicated with the liquid inlet flow channel 151 of the lower check valve liner 150, and the liquid outlet ends thereof are communicated with the liquid inlet ends of the liner flow channels 121a and 121b. The liquid outlet check valves 190a and 190b are installed in the pump body 110 and are located between the upper check valve liner 170 and the pump body liners 120a and 120b. The liquid inlet ends of the liquid outlet check valves 190a and 190b are communicated with the liquid outlet ends of the liner flow channels 121a and 121b, and the liquid outlet ends thereof are communicated with the other ends of the liquid outlet flow channels 171a and 171b of the upper check valve liner 170.

[0054] Due to the limitation of the performance of fluoroplastic materials, too high working pressure can easily cause deformation or even rupture of fluoroplastics. In order to avoid such problems, the outer part of the pump body unit 100 in the utility model is made of metal material, and its internal flow channel is made of non-metallic material. Such a structure not only ensures that the pump can operate under ultra-high pressure, but also ensures that the corrosion resistance of fluoroplastics will not be affected. In this embodiment, the pump body 110, the lower check valve body 140 and the upper check valve body 160 are made of metal materials, such as stainless steel, carbon steel or alloy steel. The pump body lining 120a, 120b, the upper check valve lining 170 and the lower check valve lining 150 are made of non-metallic materials, such as fluoroplastics such as PTFE, PCTFE, PFA, PVDF, etc. Such a structure not only ensures that the pump can operate under ultra-high pressure, but also ensures that the corrosion resistance of fluoroplastics will not be affected.

[0055] The liquid inlet check valves 180a, 180b and the liquid outlet check valves 190a, 190b are high performance check valves. Figure 4The inlet check valve 180a, 180b and the outlet check valve 190a, 190b include a valve body 310, an upper valve cover 320, a lower valve cover 330, two valve sleeves 340, an isolation sleeve 350, two valve seats 360 and two valve balls 370. The upper and lower end surfaces of the valve body 310 are open structures and a valve cavity 311 is formed therein. The upper valve cover 320 is covered on the upper end surface of the valve body 310, and an upper valve cover through hole 321 communicating with the valve cavity 311 is formed in the upper valve cover 320. The lower valve cover 330 is covered on the lower end surface of the valve body 310, and a lower valve cover through hole 331 communicating with the valve cavity 311 is formed in the lower valve cover 330. Two valve sleeves 340 are axially spaced apart and arranged in the valve cavity 311 of the valve body 310, and a valve sleeve cavity 341 is formed in each valve sleeve. The isolation sleeve 350 is disposed in the valve cavity 311 of the valve body 310 and is located between two adjacent valve sleeves 340, and is used to separate the two adjacent valve sleeves 340. The two valve seats 360 are correspondingly installed in the two valve sleeves 340 and are located at the lower end of the valve sleeve cavity 341 thereof. The two valve balls 370 are correspondingly installed in the two valve sleeves 340. Since two valve sleeves 340 are arranged in the valve body 310, it is equivalent to two ordinary one-way valves working in a stacked manner, and the working reliability and stability are greatly improved.

[0056] See also Figure 5 and Figure 6 The sensor unit 200 includes a sensor housing 210, a sensor liner 220, a pressure sensor 230, a sensor seal 240, a sensor pressure cap 250 and a vent valve 260. Two sensor liquid inlets 201 and a sensor liquid outlet 202 are formed on the surface of the sensor housing 210. The sensor liner 220 is installed in the sensor housing 210, and the sensor liner 220 is formed with a liquid confluence cavity 221, which is respectively connected with each sensor liquid inlet 201 and the sensor liquid outlet 202. The pressure sensor 230 is installed on the sensor housing 210 through the sensor pressure cap 250 and is located in the sensor liner 220. The vent valve 260 is installed on the sensor housing 210 and extends into the liquid confluence cavity 221 of the sensor liner 220. The sensor seal 240 is installed between the sensor liner 220 and the pressure sensor 230. In this embodiment, the sensor housing 210 is made of stainless steel, carbon steel or alloy steel, and the sensor lining 220 is made of fluoroplastics such as PTFE, PCTFE, PFA, and PVDF. Due to the limitation of the performance of fluoroplastics, too high working pressure can easily cause deformation or even rupture of fluoroplastics. In order to avoid such problems, the outer part of the sensor unit 200 is made of metal material, and its internal flow channel is made of non-metallic material. Such a structure ensures that the pump can operate under ultra-high pressure and ensures that the corrosion resistance of fluoroplastics will not be affected.

[0057] See also Figure 7 Combined with Figure 1 The pump body liquid outlet 102 of the pump body unit 100 and the sensor liquid inlet 201 of the sensor unit 200 are connected through a pump body infusion tube 510, and the sensor liquid outlet 202 of the sensor unit 200 is connected with an outlet tube 520. The pump body infusion tube 510 and the pump body liquid outlet 102, the pump body infusion tube 510 and the sensor liquid inlet 201, and the outlet tube 520 and the sensor liquid outlet 202 are all connected and fixed through a pipeline joint assembly 530.

[0058] The pipeline joint assembly 530 includes a spindle-shaped sealing pad 531 and a fixing screw 532. The spindle-shaped sealing pad 531 is slidably sleeved on the pump body infusion tube 510 or the liquid outlet tube 520, and the fixing screw 532 is slidably sleeved on the pump body infusion tube 510 or the liquid outlet tube 520 and is located outside the spindle-shaped sealing pad 531. During installation, the end of the pump body infusion tube 510 or the outlet tube 520 is first inserted into the pump body outlet port 102, the sensor inlet port 201 or the sensor outlet port 202, and then the fixing screw 532 is screwed into the pump body outlet port 102, the sensor inlet port 201 or the sensor outlet port 202 to press the spindle-shaped sealing gasket 531 against the inner side surface of the pump body outlet port 102, the sensor inlet port 201 or the sensor outlet port 202. The spindle-shaped sealing gasket 531 is deformed under the mutual compression of the fixing screw 532 and the conical surface of the bottom surface of the installation hole, so that the conical surfaces on both sides of the spindle-shaped sealing gasket 531 lock the outer tube surface of the pump body infusion tube 510 or the outlet tube 520.

[0059] The pipe joint assembly 530 can well fix the pump body infusion tube 510 or the outlet tube 520 by squeezing the two sides of the spindle-shaped sealing gasket 531, so that the rated value of the pressure that the pipe joint assembly 530 can withstand is greatly improved. In this way, the pump body infusion tube 510 or the outlet tube 520 will not easily burst out due to the pressure exceeding the rated value, and the safety is guaranteed. After testing, the maximum pressure that the pipe joint assembly 530 can withstand is 7MPa to 10MPa, which greatly exceeds the maximum pressure of 5MPa that the existing pipe joint can withstand, and provides a basis for the ultra-high pressure fluoroplastic infusion pump to operate under ultra-high pressure.

[0060] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An ultra-high pressure fluoroplastic infusion pump, comprising a pump unit, wherein the pump unit has at least one pump inlet and at least one pump outlet; characterized in that: The pump unit comprises: A pump body, wherein at least one pump chamber is formed in the pump body; A pump body liner is arranged in each pump cavity of the pump body, wherein a liner flow channel is formed in the pump body liner; A plunger rod assembly is arranged in the lining of each pump body, a sealing ring assembly is coaxially arranged on the outer peripheral surface of the front end of the plunger rod assembly and is slidably sealed with the plunger rod assembly, and the front end of the plunger rod assembly coaxially passes through the sealing ring assembly and then extends into the lining of the pump body; A lower one-way valve body installed on the bottom surface of the pump body, wherein the lower one-way valve body is provided with at least one lower one-way valve body liquid inlet, and the lower one-way valve body liquid inlet serves as a pump body liquid inlet of the pump body unit; A lower one-way valve liner installed in the lower one-way valve body, wherein the lower one-way valve liner is provided with a liquid inlet channel, and one end of the liquid inlet channel is connected to a lower one-way valve body liquid inlet port of the lower one-way valve body; An upper one-way valve body installed on the top surface of the pump body, wherein the upper one-way valve body is provided with at least one upper one-way valve body liquid outlet, and the upper one-way valve body liquid outlet serves as a pump body liquid outlet of the pump body unit; An upper one-way valve liner is arranged in the upper one-way valve body, wherein a liquid outlet flow channel is formed in the upper one-way valve liner, and one end of the liquid outlet flow channel is communicated with the upper one-way valve body liquid outlet of the upper one-way valve body; a liquid inlet check valve installed in the pump body and located between the lower check valve liner and each pump body liner, wherein the liquid inlet end of the liquid inlet check valve is communicated with the liquid inlet flow channel of the lower check valve liner, and the liquid outlet end of the liquid inlet check valve is communicated with the liquid inlet end of the liner flow channel of the corresponding pump body liner; and A liquid outlet one-way valve is installed in the pump body and located between the upper one-way valve lining and each pump body lining, wherein the liquid inlet end of the liquid outlet one-way valve is connected to the liquid outlet end of the lining flow channel of the corresponding pump body lining, and the liquid outlet end of the liquid outlet valve is connected to the liquid outlet flow channel of the upper one-way valve lining.

2. The ultra-high pressure fluoroplastic infusion pump according to claim 1, characterized in that: The pump body lining, the upper one-way valve lining and the lower one-way valve lining are made of non-metallic materials, and the pump body, the lower one-way valve body and the upper one-way valve body are made of metallic materials.

3. The ultra-high pressure fluoroplastic infusion pump according to claim 2, characterized in that: The non-metallic material is fluoroplastic, and the metal material is one of stainless steel, carbon steel or alloy steel.

4. The ultra-high pressure fluoroplastic infusion pump according to claim 1, characterized in that: The liquid inlet check valve and / or liquid outlet check valve comprises: A valve body, wherein the upper and lower end surfaces of the valve body are open structures and a valve cavity is formed therein; An upper valve cover is arranged on the upper end surface of the valve body, and at least one upper valve cover through hole communicating with the valve cavity is opened in the upper valve cover; A lower valve cover is arranged on the lower end surface of the valve body, and at least one lower valve cover through hole communicating with the valve cavity is opened in the lower valve cover; At least two valve sleeves are axially spaced apart and arranged in the valve cavity of the valve body, each valve sleeve forming a valve sleeve cavity; An isolation sleeve disposed in the valve cavity of the valve body and between two adjacent valve sleeves for isolating the two adjacent valve sleeves; a valve seat mounted in each valve sleeve and located at the lower end of the valve sleeve cavity thereof; and A valve ball is installed in each valve sleeve.

5. The ultra-high pressure fluoroplastic infusion pump according to claim 1, characterized in that: The sealing ring assembly includes a sealing ring body, a sealing ring spring and a sealing ring cover. The sealing ring body is installed on the end of a preset step channel lining the pump body and is sleeved on the plunger rod of the plunger rod assembly. An annular groove is formed on the front end surface of the sealing ring body. The sealing ring spring is arranged in the annular groove of the sealing ring body. The sealing ring cover is installed on the front end surface of the sealing ring body and is used to seal the sealing ring spring in the annular groove of the sealing ring body.

6. The ultra-high pressure fluoroplastic infusion pump according to any one of claims 1 to 5, characterized in that: It also includes a sensor unit with a pressure monitoring function, wherein the sensor unit has at least one sensor liquid inlet and at least one sensor liquid outlet, and the sensor liquid inlet of the sensor unit is correspondingly connected to the pump body liquid outlet of the pump body unit.

7. The ultra-high pressure fluoroplastic infusion pump according to claim 6, characterized in that: The sensor unit includes a sensor housing, a sensor liner, a pressure sensor, a sensor sealing gasket, a sensor pressure cap, and a vent valve. At least one sensor liquid inlet and a sensor liquid outlet are formed on the surface of the sensor housing. The sensor liner is installed in the sensor housing. The sensor liner forms a liquid collecting cavity, and the liquid collecting cavity is respectively connected with each sensor liquid inlet and sensor liquid outlet. The pressure sensor is installed on the sensor housing through the sensor pressure cap and is located in the sensor liner. The vent valve is installed on the sensor housing and extends into the liquid collecting cavity of the sensor liner. The sensor sealing gasket is installed between the sensor liner and the pressure sensor.

8. The ultra-high pressure fluoroplastic infusion pump according to claim 7, characterized in that: The sensor housing is made of stainless steel, carbon steel or alloy steel, and the sensor lining is made of fluoroplastic.

9. The ultra-high pressure fluoroplastic infusion pump according to claim 6, characterized in that: The pump body liquid outlet of the pump body unit and the sensor liquid inlet of the sensor unit are connected through a pump body infusion tube, the sensor liquid outlet of the sensor unit is connected with an outlet tube, and the pump body infusion tube and the pump body liquid outlet, the pump body infusion tube and the sensor liquid inlet, and the outlet tube and the sensor liquid outlet are all connected and fixed through a pipeline joint assembly.

10. The ultra-high pressure fluoroplastic infusion pump according to claim 9, characterized in that: The pipe joint assembly includes a spindle-shaped sealing gasket and a fixing screw, wherein the spindle-shaped sealing gasket is slidably mounted on the pump body infusion tube or the outlet tube, and the fixing screw is slidably mounted on the pump body infusion tube or the outlet tube and is located on the outside of the spindle-shaped sealing gasket; during installation, the end of the pump body infusion tube or the outlet tube is first inserted into the pump body outlet, the sensor inlet or the sensor outlet, and then the fixing screw is screwed into the pump body outlet, the sensor inlet or the sensor outlet to press the spindle-shaped sealing gasket against the inner side surface of the pump body outlet, the sensor inlet or the sensor outlet, and the spindle-shaped sealing gasket is deformed under the mutual compression of the conical surfaces of the fixing screw and the bottom surface of the mounting hole, so that the conical surfaces on both sides of the spindle-shaped sealing gasket lock the outer tube surface of the pump body infusion tube or the outlet tube.

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