Lubricating oil storage tank with internal circulation system

Abstract

The utility model relates to a lubricating oil storage tank with an internal circulation system, and belongs to the technical field of lubricating oil production. Comprising a tank body and a circulating pump, an inlet of the circulating pump is communicated with a multi-depth oil taking mechanism on the tank body through an oil supply main pipe, an outlet of the circulating pump is communicated with a first connector of a three-way connector A, and a second connector of the three-way connector A is connected with a discharging pipe; a third connector of the three-way connector A is connected with a mixer at the top in the tank body through a return pipe, an electric control valve E is arranged on the discharge pipe, and an electric control valve F is arranged on the return pipe. Compared with the prior art, the lubricating oil storage tank has the advantages that when lubricating oil in the tank body is stored for a long time, the circulating pump and the electric control valve F can be opened, the electric control valve E can be closed, the lubricating oil at different depths in the tank body is pumped into the mixer through the circulating pump at the same time to be mixed and then flows into the tank body again, and the problem of layering caused by long-time standing of the lubricating oil is solved; better uniformity is realized, so that the lubricating property is recovered.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lubricating oil storage tank with internal circulation system belongs to lubricating oil production technical field. BACKGROUND

[0002] Lubricating oil is a common lubricant, so-called lubricant, often used between two relative motion objects, has the function of reducing the friction of two objects due to contact.

[0003] The utility model discloses a lubricating oil storage tank. Including the jar body and the lid, the lid is screwed in the top of jar body, the jar body inside slide has the scraper disc, the scraper disc and the lid are connected through the drawstring, the lid is provided with the adsorption structure for the scraper disc spacing, the scraper disc can float on the lubricating oil, the adsorption structure includes magnet and adsorption platform, the magnet places in the lid top surface center part, the adsorption platform fixedly arranged in the top surface center part of scraper disc, the utility model discloses, through setting the scraper disc in the jar body

[0004] The above-mentioned patent can realize the lubricating oil storage function, but the current technology is not comprehensive, and has the following disadvantages: since the lubricating oil is composed of base oil and various additives, these components may undergo some physical changes after standing for more than 3 months, and need to be fully stirred after standing to restore performance, but the existing lubricating oil storage tank lacks sufficient stirring measures.

[0005] To solve one of the above problems, a lubricating oil storage tank with internal circulation system is urgently needed. Utility model content

[0006] According to the deficiencies in the above prior art, the technical problem to be solved by the utility model is: how to pump the lubricating oil at different depths in the jar body into the mixer through the circulating pump at the same time for mixing, and then flow into the jar body again, solve the stratification problem caused by long-term standing of lubricating oil, have better uniformity, restore lubricating performance, therefore provide a lubricating oil storage tank with internal circulation system.

[0007] The lubricating oil storage tank with internal circulation system, comprising a jar body and a circulating pump, characterized in that: the inlet of the circulating pump is communicated with the multi-depth oil taking mechanism on the jar body through the oil supply main pipe, the outlet of the circulating pump is communicated with the first interface of the three-way joint A, the second interface of the three-way joint A is connected with the external discharge pipe, the third interface of the three-way joint A is connected with the mixer at the top in the jar body through the return pipe, the external discharge pipe is provided with an electric control valve E, and the return pipe is provided with an electric control valve F.

[0008] When the lubricating oil in the tank is stored for a long time, the circulation pump and the electric control valve F can be opened, and the electric control valve E is closed, so that the lubricating oil at different depths in the tank is pumped into the mixer at the same time, mixed, and then flows back into the tank, solving the problem of stratification caused by long-term static lubricating oil, having better uniformity, and restoring the lubricating performance.

[0009] When the mixed liquid in the tank needs to be discharged, only the electric control valve F is closed, the circulation pump and the electric control valve E are opened, so that the lubricating oil in the tank is discharged outside the tank through the discharge pipe by the circulation pump.

[0010] Preferably, the multi-depth oil taking mechanism comprises four groups of oil outlets arranged along the height direction of the tank, and the first oil supply branch pipe, the second oil supply branch pipe, the third oil supply branch pipe and the fourth oil supply branch pipe are respectively arranged on the four groups of oil outlets arranged from top to bottom, and the electric control valve A, the electric control valve B, the electric control valve C and the electric control valve D are respectively arranged on the first oil supply branch pipe, the second oil supply branch pipe, the third oil supply branch pipe and the fourth oil supply branch pipe, the signal output end of the electric control valve A is electrically connected with the controller A, and the liquid level sensor A electrically connected with the controller A is arranged in the tank, and the liquid level sensor A is used to cooperate with the controller A to control the on-off of the first oil supply branch pipe, the signal output end of the electric control valve B is electrically connected with the controller B, and the liquid level sensor B electrically connected with the controller B is arranged in the tank, and the liquid level sensor B is used to cooperate with the controller B to control the on-off of the second oil supply branch pipe, the signal output end of the electric control valve C is electrically connected with the controller C, and the liquid level sensor C electrically connected with the controller C is arranged in the tank, and the liquid level sensor C is used to cooperate with the controller C to control the on-off of the third oil supply branch pipe, the signal output end of the electric control valve D is electrically connected with the controller D, and the liquid level sensor D electrically connected with the controller D is arranged in the tank, and the liquid level sensor D is used to cooperate with the controller D to control the on-off, and the first oil supply branch pipe, the second oil supply branch pipe, the third oil supply branch pipe and the fourth oil supply branch pipe are in communication with the oil supply main pipe.

[0011] When the liquid level in the tank exceeds the liquid level sensor A, the liquid level sensor A, the liquid level sensor B, the liquid level sensor C and the liquid level sensor D control the electric control valve A, the electric control valve B, the electric control valve C and the electric control valve D to be in the open state, when the liquid level in the tank is lower than the liquid level sensor B and higher than the liquid level sensor C, the liquid level sensor A and the liquid level sensor B control the electric control valve A and the electric control valve B to be closed, and the liquid level sensor C and the liquid level sensor D control the electric control valve C and the electric control valve D to be opened, so that the oil supply main pipe can extract oil at different heights, which helps to ensure the uniformity of product quality.

[0012] Preferably, the mixer comprises an outer shell and an extension pipe, the outer shell is a hollow structure, the bottom of the outer shell is provided with a circular shell bottom, a tank inner branch pipe is arranged on the outer wall of the outer shell and communicates with the inner cavity of the outer shell, the oil inlet direction of the tank inner branch pipe is along the tangent direction of the circular section of the inner cavity of the outer shell, the outer shell is connected with the upper cover of the tank body through a connecting disc, the center of the circular shell bottom of the outer shell is provided with a shield, the shield is provided with an oil passing hole, the circular shell bottom is provided with a circular hole matched with the shield, the extension pipe extends to the shield through the tank body and the shield, the shield is provided with a spherical nozzle connected with the extension pipe, the outer shell is provided with a hemispherical nozzle B connected with the extension pipe, and the upper end of the extension pipe is connected with a tee joint B.

[0013] When the electric control valve F is opened, the lubricating oil pumped out by the circulating pump is divided into two paths and enters the tank outer branch pipe and the tank inner branch pipe respectively, the lubricating oil flowing through the tank outer branch pipe is sprayed out through the hemispherical nozzle B and the spherical nozzle respectively, and the lubricating oil sprayed out by the hemispherical nozzle B can be mixed with the lubricating oil sprayed out by the tank inner branch pipe in the outer shell, so that the lubricating oil in the outer shell is discharged through the oil hole and then mixed with the lubricating oil discharged by the spherical nozzle again, thereby improving the mixing efficiency and helping to ensure the uniformity of product quality.

[0014] Preferably, the third interface of the tee joint B is connected with an oil inlet pipe, and an oil inlet pipe electric control valve is arranged on the oil inlet pipe. When it is necessary to supplement new lubricating oil into the tank body, the oil inlet pipe electric control valve can be opened, the lubricating oil outside the tank body passes through the remaining pump body, the oil inlet pipe, the oil inlet pipe electric control valve, the tee joint B, the extension pipe, the hemispherical nozzle B, the oil passing hole and the spherical nozzle to enter the tank body, after the new oil is injected, the oil inlet pipe electric control valve is closed, and the circulating pump and the electric control valve F can be opened, so that the mixing efficiency of new and old lubricating oil is improved, and the uniformity of product quality is ensured.

[0015] Preferably, a liquid level meter is arranged on the outer wall of the tank body.

[0016] Preferably, the liquid level sensor A is an optical liquid level sensor.

[0017] Preferably, the circulating pump is a plunger pump.

[0018] Compared with the prior art, the lubricating oil storage tank with an internal circulation system has the following beneficial effects:

[0019] The lubricating oil storage tank with an internal circulation system has the following beneficial effects: When the lubricating oil in the tank body is stored for a long time, the circulating pump and the electric control valve F can be opened, and the electric control valve E is closed, so that the lubricating oil at different depths in the tank body is pumped into the mixer at the same time for mixing, and then flows into the tank body again, thereby solving the stratification problem caused by long-time standing of the lubricating oil, improving the uniformity, and restoring the lubricating performance.

[0020] The lubricating oil storage tank with the internal circulation system, when the liquid level in the tank body exceeds the liquid level sensor A, the liquid level sensor A, the liquid level sensor B, the liquid level sensor C and the liquid level sensor D control the electric control valve A, the electric control valve B, the electric control valve C and the electric control valve D to be in the open state respectively, when the liquid level in the tank body is lower than the liquid level sensor B and higher than the liquid level sensor C, the liquid level sensor A and the liquid level sensor B control the electric control valve A and the electric control valve B to be closed respectively, and the liquid level sensor C and the liquid level sensor D control the electric control valve C and the electric control valve D to be opened respectively, so that the oil supply main pipe can extract oil at different heights, and the uniformity of product quality is ensured.

[0021] The lubricating oil storage tank with the internal circulation system, after new oil filling is completed, the oil inlet pipe electric control valve is closed, and the circulating pump and the electric control valve F can be opened, so that the mixing efficiency of new and old lubricating oils is improved, and the uniformity of product quality is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, various elements or parts are not necessarily drawn according to the actual proportions.

[0023] Figure 1 It is a structural schematic view of the utility model;

[0024] Figure 2 It is a structural schematic view of the mixer of the utility model;

[0025] Figure 3 It is an installation position view of the liquid level sensor A.

[0026] In the drawings: 1, tank body 2, circulating pump 3, oil supply main pipe 4, discharge pipe 5, three-way joint A 6, return pipe 7, mixer 7.1, outer shell 7.2, connecting disc 7.3, tank inner branch pipe 7.4, shield 7.5, oil passing hole 7.6, spherical nozzle 7.7, semispherical nozzle B 7.8, extension pipe 7.9, three-way joint B 7.10, tank outer branch pipe 8, first oil supply branch pipe 9, second oil supply branch pipe 10, third oil supply branch pipe 11, fourth oil supply branch pipe 12, electric control valve A 13, electric control valve B 14, electric control valve C 15, electric control valve D 16, liquid level sensor A 17, liquid level sensor B 18, liquid level sensor C 19, liquid level sensor D 20, electric control valve E 21, electric control valve F 22, oil inlet pipe electric control valve 23, oil inlet pipe. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings: The present invention will be further described below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0028] Example 1, such as Figures 1-2 As shown, the lubricating oil storage tank with an internal circulation system includes a tank body 1 and a circulation pump 2. The inlet of the circulation pump 2 is connected to a multi-depth oil extraction mechanism on the tank body 1 through an oil supply main pipe 3. The outlet of the circulation pump 2 is connected to the first interface of a three-way connector A5. The second interface of the three-way connector A5 is connected to an external drain pipe 4. The third interface of the three-way connector A5 is connected to a mixer 7 at the top of the tank body 1 through a return pipe 6. An electrically controlled valve E20 is installed on the external drain pipe 4, and an electrically controlled valve F21 is installed on the return pipe 6.

[0029] When the lubricating oil in tank 1 has been stored for a long time, the circulation pump 2 and the electric control valve F21 can be turned on and the electric control valve E20 can be turned off. The lubricating oil at different depths in tank 1 can be pumped into the mixer 7 through the circulation pump 2 for mixing, and then flow back into tank 1. This solves the problem of stratification caused by the lubricating oil standing for a long time, and has better uniformity to restore lubrication performance.

[0030] When it is necessary to discharge the mixture in tank 1, simply close the electronically controlled valve F21 and turn on the circulation pump 2 and electronically controlled valve E20. The lubricating oil in tank 1 can then be discharged from tank 1 through the external discharge pipe 4 via the circulation pump 2.

[0031] Example 2, as Figures 1-3 As shown, the lubricating oil storage tank with an internal circulation system includes a tank body 1 and a circulation pump 2. The inlet of the circulation pump 2 is connected to a multi-depth oil extraction mechanism on the tank body 1 through an oil supply main pipe 3. The outlet of the circulation pump 2 is connected to the first interface of a three-way connector A5. The second interface of the three-way connector A5 is connected to an external drain pipe 4. The third interface of the three-way connector A5 is connected to a mixer 7 at the top of the tank body 1 through a return pipe 6. An electrically controlled valve E20 is installed on the external drain pipe 4, and an electrically controlled valve F21 is installed on the return pipe 6.

[0032] Further, the multi-depth oil extraction mechanism comprises four groups of oil outlets arranged along the height direction of the tank body 1, and the first oil supply branch pipe 8, the second oil supply branch pipe 9, the third oil supply branch pipe 10 and the fourth oil supply branch pipe 11 are respectively arranged on the four groups of oil outlets arranged from top to bottom. The electric control valve A 12, the electric control valve B 13, the electric control valve C 14 and the electric control valve D 15 are respectively arranged on the first oil supply branch pipe 8, the second oil supply branch pipe 9, the third oil supply branch pipe 10 and the fourth oil supply branch pipe 11. The electric control valve A 12 is electrically connected with the signal output end of the controller A, and the liquid level sensor A 16 electrically connected with the controller A is arranged in the tank body 1. The liquid level sensor A 16 is used to control the on-off of the first oil supply branch pipe 8 in cooperation with the controller A. The electric control valve B 13 is electrically connected with the signal output end of the controller B, and the liquid level sensor B 17 electrically connected with the controller B is arranged in the tank body 1. The liquid level sensor B 17 is used to control the on-off of the second oil supply branch pipe 9 in cooperation with the controller B. The electric control valve C 14 is electrically connected with the signal output end of the controller C, and the liquid level sensor C 18 electrically connected with the controller C is arranged in the tank body 1. The liquid level sensor C 18 is used to control the on-off of the third oil supply branch pipe 10 in cooperation with the controller C. The electric control valve D 15 is electrically connected with the signal output end of the controller D, and the liquid level sensor D 19 electrically connected with the controller D is arranged in the tank body 1. The liquid level sensor D 19 is used to control the on-off of the fourth oil supply branch pipe 11 in cooperation with the controller D. The first oil supply branch pipe 8, the second oil supply branch pipe 9, the third oil supply branch pipe 10 and the fourth oil supply branch pipe 11 are all connected with the oil supply main pipe 3.

[0033] When the liquid level in the tank body 1 exceeds the liquid level sensor A 16, the liquid level sensor A 16, the liquid level sensor B 17, the liquid level sensor C 18 and the liquid level sensor D 19 control the electric control valve A 12, the electric control valve B 13, the electric control valve C 14 and the electric control valve D 15 to be in the open state respectively. When the liquid level in the tank body 1 is lower than the liquid level sensor B 17 and higher than the liquid level sensor C 18, the liquid level sensor A 16 and the liquid level sensor B 17 control the electric control valve A 12 and the electric control valve B 13 to be closed respectively, and the liquid level sensor C 18 and the liquid level sensor D 19 control the electric control valve C 14 and the electric control valve D 15 to be opened respectively, so that the oil supply main pipe 3 can extract oil at different heights, which helps to ensure the uniformity of product quality.

[0034] Further, the mixer 7 comprises an outer shell 7.1 and an extension pipe 7.8, the outer shell 7.1 is a hollow structure, the bottom of the outer shell 7.1 is a circular bottom, a tank inner branch pipe 7.3 is arranged on the outer wall of the outer shell 7.1 and communicates with the inner cavity of the outer shell 7.1, the oil inlet direction of the tank inner branch pipe 7.3 is along the tangent direction of the circular section of the inner cavity of the outer shell 7.1, the outer shell 7.1 is connected with the upper cover of the tank body 1 through a connecting disc 7.2, the center of the circular bottom of the outer shell 7.1 is provided with a shield 7.4, an oil passing hole 7.5 is arranged on the shield 7.4, a circular hole matched with the shield 7.4 is arranged on the circular bottom, the extension pipe 7.8 extends through the tank body 1 and the shield 7.4 and reaches the shield 7.4, the shield 7.4 is provided with a spherical nozzle 7.6 connected with the extension pipe 7.8, the outer shell 7.1 is provided with a hemispherical nozzle B7.7 connected with the extension pipe 7.8, the upper end of the extension pipe 7.8 is connected with a three-way joint B7.9, the second interface of the three-way joint B7.9 is connected with a tank outer branch pipe 7.10.

[0035] After the electric control valve F21 is opened, the lubricating oil pumped out by the circulating pump 2 is divided into two paths and enters the tank outer branch pipe 7.10 and the tank inner branch pipe 7.3 respectively, the lubricating oil flowing through the tank outer branch pipe 7.10 is sprayed out through the hemispherical nozzle B7.7 and the spherical nozzle 7.6 respectively, the lubricating oil sprayed out by the hemispherical nozzle B7.7 can be mixed with the lubricating oil sprayed out by the tank inner branch pipe 7.3 in the outer shell 7.1, the lubricating oil in the outer shell 7.1 is discharged through the oil hole 7.5 and then mixed with the lubricating oil sprayed out by the spherical nozzle 7.6 again, which improves the mixing efficiency and helps to ensure the uniformity of product quality.

[0036] Further, the third interface of the three-way joint B7.9 is connected with an oil inlet pipe 23, the oil inlet pipe 23 is provided with an oil inlet pipe electric control valve 22. When it is necessary to supplement new lubricating oil into the tank body 1, the oil inlet pipe electric control valve 22 can be opened, the lubricating oil outside the tank body 1 enters the tank body 1 through the remaining pump body, the oil inlet pipe 23, the oil inlet pipe electric control valve 22, the three-way joint B7.9, the extension pipe 7.8, the hemispherical nozzle B7.7, the oil passing hole 7.5 and the spherical nozzle 7.6, after the new oil injection is completed, the oil inlet pipe electric control valve 22 is closed, and the circulating pump 2 and the electric control valve F21 can be opened, so that the mixing efficiency of new and old lubricating oil is improved, which helps to ensure the uniformity of product quality.

[0037] Further, the outer wall of the tank body 1 is provided with a liquid level meter 24.

[0038] Further, the liquid level sensor A16 is an optical liquid level sensor.

[0039] Further, the circulating pump 2 is a plunger pump.

[0040] The utility model discloses a lubricating oil storage tank with internal circulation system, when the lubricating oil in the tank body is stored for a long time, can open circulation pump and electric control valve F, and close electric control valve E, and the lubricating oil of different depth in the tank body is pumped into the mixer for mixing through the circulation pump simultaneously, then reflows into the tank body, solves the delamination problem caused by the long time standing of lubricating oil, has better uniformity, restores lubricating performance.

[0041] The utility model discloses a lubricating oil storage tank with internal circulation system, when the liquid level height in the tank body exceeds liquid level sensor A, liquid level sensor A, liquid level sensor B, liquid level sensor C, liquid level sensor D control electric control valve A, electric control valve B, electric control valve C and electric control valve D are in the opening state respectively, when the liquid level height in the tank body is lower than liquid level sensor B and higher than liquid level sensor C, then liquid level sensor A, liquid level sensor B control electric control valve A, electric control valve B closes respectively, liquid level sensor C, liquid level sensor D control electric control valve C, electric control valve D opens respectively, to guarantee that oil supply main pipe can extract the oil liquid of different height, help to ensure the uniformity of product quality.

[0042] The utility model discloses a lubricating oil storage tank with internal circulation system, after new oil filling is completed, closes the electric control valve of oil inlet pipe, and can open circulation pump and electric control valve F, makes new and old lubricating oil mixing efficiency, help to ensure the uniformity of product quality.

[0043] The above shows and describes the basic principle, main features and advantages of the utility model. The skilled person in the art should understand that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the application. Without departing from the spirit and scope of the utility model, the utility model can also have various changes and improvements, and these changes and improvements fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

[0044] The details of the application not described are well-known to those skilled in the art.

Claims

1. A lubricating oil reservoir having an internal circulation system comprising a tank and a circulation pump characterised in that: The inlet of the circulating pump is communicated with the multi-depth oil taking mechanism on the tank body through the oil supply main pipe, the outlet of the circulating pump is communicated with the first interface of the three-way joint A, the second interface of the three-way joint A is connected with the external discharge pipe, the third interface of the three-way joint A is connected with the mixer at the top of the tank body through the return pipe, the external discharge pipe is provided with an electric control valve E, and the return pipe is provided with an electric control valve F.

2. The lubricating oil reservoir with internal circulation system according to claim 1, characterized in that, The multi-depth oil taking mechanism comprises four groups of oil outlets arranged along the height direction of the tank body, the four groups of oil outlets arranged from top to bottom are respectively provided with a first oil supply branch pipe, a second oil supply branch pipe, a third oil supply branch pipe and a fourth oil supply branch pipe, the first oil supply branch pipe, the second oil supply branch pipe, the third oil supply branch pipe and the fourth oil supply branch pipe are respectively provided with an electric control valve A, an electric control valve B, an electric control valve C and an electric control valve D, the electric control valve A is electrically connected with the signal output end of a controller A, and a liquid level sensor A electrically connected with the controller A is arranged in the tank body, the liquid level sensor A is used for cooperating with the controller A to control the on-off of the first oil supply branch pipe, the electric control valve B is electrically connected with the signal output end of a controller B, and a liquid level sensor B electrically connected with the controller B is arranged in the tank body, the liquid level sensor B is used for cooperating with the controller B to control the on-off of the second oil supply branch pipe, the electric control valve C is electrically connected with the signal output end of a controller C, and a liquid level sensor C electrically connected with the controller C is arranged in the tank body, the liquid level sensor C is used for cooperating with the controller C to control the on-off of the third oil supply branch pipe, the electric control valve D is electrically connected with the signal output end of a controller D, and a liquid level sensor D electrically connected with the controller D is arranged in the tank body, the liquid level sensor D is used for cooperating with the controller D to control the on-off, and the first oil supply branch pipe, the second oil supply branch pipe, the third oil supply branch pipe and the fourth oil supply branch pipe are communicated with the oil supply main pipe.

3. The lubricating oil reservoir with internal circulation system according to claim 2, characterized in that, The mixer comprises an outer shell and an extension pipe, the outer shell is in a hollow structure, the bottom of the outer shell is provided with a circular shell bottom, the outer wall of the outer shell is provided with a tank inner branch pipe communicated with the inner cavity of the outer shell, the oil inlet direction of the tank inner branch pipe is along the tangent direction of the circular cross section of the inner cavity of the outer shell, the outer shell is connected with the upper cover of the tank body through a connecting disc, the center of the circular shell bottom of the outer shell is provided with a shield, the shield is provided with an oil passing hole, the circular shell bottom is provided with a circular hole matched with the shield, the extension pipe extends through the tank body and the shield to the shield, the shield is provided with a spherical nozzle connected with the extension pipe, the outer shell is provided with a hemispherical nozzle B connected with the extension pipe, and the upper end of the extension pipe is connected with a three-way joint B.

4. The lubricating oil reservoir with internal circulation system according to claim 3, characterized in that, The third interface of the three-way joint B is connected with an oil inlet pipe, and the oil inlet pipe is provided with an oil inlet pipe electric control valve.

5. The lubricating oil reservoir with internal circulation system according to claim 4, characterized in that, A liquid level meter is arranged on the outer wall of the tank body.

6. The lubricating oil reservoir with internal circulation system according to claim 5, characterized in that, The liquid level sensor A is a photoelectric liquid level sensor.

7. The lubricating oil sump tank having an internal circulation system according to any one of claims 1 to 6, characterized in that, The circulating pump is a plunger pump.

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