An automatic precision filtering chiller

Abstract

The present invention provides an automatic precision filtering chiller, comprising: a water tank, which is provided with a circulating water inlet and a purified water outlet; a water-using device is connected to the circulating water inlet, and the cooling water used by the water-using device is conveyed into the water tank, filtered and cooled, and then flows out of the water tank through the purified water outlet; a filtering container is installed in the water tank for filtering the cooling water fed from the circulating water inlet; a water pump in the cooling water circulation circuit pumps the purified water flowing out of the purified water outlet to a first filter for fine filtration, and then sends it into the water-using device for recycling; a pre-filtering circuit is used to pre-filter the sewage in the filtering container and send it into the water pump, and then merge it into the cooling water circulation circuit. The present invention collects all the dirt in the filtering container and the first filter into the pre-filter for filtering, reduces the cleaning workload of the filter, is easy to maintain and operate, and reduces the workload of operation and maintenance; the present invention conducts multi-stage filtration on the circulating cooling water, the cooling water has high cleanliness, and the damage to the water-using device is small.

Description

Technical Field

[0001] The invention belongs to the technical field of filtration, and in particular relates to an automatic precision filtration chiller. Background Art

[0002] The main function of a traditional chiller is to cool the circulating cooling water used by the equipment. For example, in injection molding, cooling circulating water is needed to cool the mold. In the chemical industry, circulating cooling water is needed to cool the heat released by the production reaction. The circulating cooling water increases its own temperature during the heat exchange process, and brings in scale and impurities after passing through the mold or chemical equipment. Some chillers are equipped with simple coarse filtration devices, which are difficult to effectively filter the scale and impurities in the circulating cooling water, resulting in many precision molds and equipment being unable to be used normally due to scale impurities, greatly increasing the workload of operators and mechanics, and causing unstable product output and quality. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic precision filtering chiller which can precisely filter circulating cooling water and is easy to maintain and operate.

[0004] The present invention provides the following technical solutions:

[0005] An automatic precision filtering water chiller, comprising:

[0006] A water tank, wherein the water tank is provided with a circulating water inlet and a clean water outlet; a water-using device is connected to the circulating water inlet, and cooling water used by the water-using device is transported into the water tank for filtration and cooling, and then flows out of the water tank through the clean water outlet;

[0007] A filter container, installed in the water tank, for filtering cooling water fed in from a circulating water inlet;

[0008] A cooling water circulation loop, wherein the water pump of the cooling water circulation loop pumps the clean water flowing out of the clean water outlet to the first filter for fine filtration, and then sends the clean water to the water-using equipment for recycling;

[0009] The pre-filtering circuit is used to pre-filter the sewage in the filtering container and then send it to the water pump, and then merge it into the cooling water circulation circuit.

[0010] Preferably, the cooling water circulation loop also includes a drain pipe, one end of which is connected to the sewage interface of the first filter and the other end is connected to the filter container; the drain pipe sends the sewage in the first filter into the filter container for filtration, and the filtered dirt is collected in the pre-filter.

[0011] Preferably, the cooling water circulation loop further includes a manual sewage discharge branch and an automatic sewage discharge branch connected in parallel between the sewage interface of the first filter and the sewage discharge pipe. A manual sewage discharge switch is installed on the manual sewage discharge branch, and a solenoid valve is installed on the automatic sewage discharge branch.

[0012] Preferably, the pre-filtering loop includes a pre-filter and a first pipeline, a first valve, a second pipeline, a second valve, and a third pipeline connected in sequence. The pre-filter is installed on the second pipeline. The water inlet end of the first pipeline is inserted into the filtering container, and the water outlet end of the third pipeline is connected to the water inlet of the water pump. The first valve and the second valve are respectively located at both ends of the second pipeline, and the first valve and the second valve can be closed to disassemble the pre-filter from the second pipeline.

[0013] Preferably, the filtering container is a filter tank, a first filter screen is installed in the filter tank, a sewage discharge port is provided on the first filter screen, and the water inlet end of the first pipeline is located below the first filter screen and fixed on the sewage discharge port.

[0014] Preferably, a sewage inlet is installed on the side wall of the filter tank above the first filter screen, and the sewage inlet is far from the sewage discharge port. The end of the sewage discharge pipe is fixed on the sewage inlet.

[0015] Preferably, a horizontal stabilizing plate is further installed at the bottom of the filter tank. The stabilizing plate is provided with holes in an array for stabilizing the flow of the filtered water and then flowing out of the filter tank.

[0016] Furthermore, at least one second filter screen is installed in the water tank. The second filter screen is detachably installed. The second filter screen divides the water tank into a preliminary filtration area and a secondary filtration area. The filter tank is located in the preliminary filtration area, and the purified water outlet is located in the secondary filtration area.

[0017] Preferably, a refrigeration coil is further installed in the water tank for cooling the circulating water.

[0018] Furthermore, a fourth pipeline and a fifth pipeline are connected in parallel to the purified water outlet through a three-way regulating valve. The fourth pipeline is connected to the water pump, and the fifth pipeline is connected to the evaporator. The evaporator, the compressor, and the condenser are connected to form a compression refrigeration unit capable of cooling the purified water.

[0019] The beneficial effects of the present invention are:

[0020] The present invention is used to filter and cool the recycled cooling water after use and then re - transport it to the water - using equipment for recycling. The overall filtration of the cooling water is carried out in two steps. One is the cooling water circulation loop. The water pump in the cooling water circulation loop pumps the purified water flowing out of the purified water outlet to the first filter for fine filtration, and then sends it to the water - using equipment for use. After the dirt in the first filter is deposited, it is sent to the filtering container in the water tank through the sewage discharge pipe for filtration. 1. The filtered circulating water is discharged from the purified water outlet of the water tank, and then the above - mentioned conveying action of the cooling water circulation loop is repeated. 2. The sewage filtered by the filtering container flows into the pre - filter in the pre - filtration loop, is filtered again and then sent into the water pump, and after converging with the cooling water circulation loop, it is sent to the water - using equipment for use.

[0021] During the entire circulation of the cooling water, this equipment passes through at least 4 filtering devices, effectively intercepting the tiny impurities that come out with the water in the equipment and molds. This equipment concentrates the dirt in the filtering container and the first filter to the pre - filter. Usually, only the pre - filter needs to be cleaned regularly, reducing the workload of equipment maintenance.

[0022] The filtering container of the present invention is a filter tank, which can hold a certain amount of sewage. Valves are installed upstream and downstream of the pre - filter. Therefore, when cleaning the pre - filter, the valves upstream and downstream can be closed first, and then the pre - filter can be disassembled from the pre - filtration loop to clean the dirt, without the need for shutdown operation.

[0023] A manual sewage discharge branch and an automatic sewage discharge branch are connected in parallel to the sewage interface of the first filter of the present invention, and the on / off situation between the first filter and the sewage discharge pipe can be selected for manual control or automatic control according to production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0025] Figure 1 is the overall structural schematic diagram of the present invention;

[0026] Figure 2 is the partial structural schematic diagram of the installation of the sewage discharge pipe, the first pipeline and the first filter screen in the filtering container;

[0027] Figure 3 is the top - view structural schematic diagram of the filtering container 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Embodiment 1

[0029] As Figure 1 and Figure 2As shown in the figure, an automatic precision filtering chiller includes: a water tank 1, a filtering container 2, a cooling water circulation circuit, and a pre-filtering circuit.

[0030] The water tank 1 is provided with a circulating water inlet 3, a purified water outlet 4, and a sewage outlet 5. The water-using equipment is connected to the circulating water inlet 3. After the cooling water used by the water-using equipment is filtered and cooled in the water tank 1 through the circulating water inlet 3, it flows out of the water tank 1 from the purified water outlet 4. A sewage outlet 5 is arranged at the bottom of the water tank 1. The sewage outlet 5 can be opened according to the dirt deposition situation in the water tank to discharge the dirt and clean the water tank.

[0031] Since the temperature of the cooling water after heat exchange is relatively high, a refrigeration coil 6 is installed in the water tank 1 to cool the used cooling water. A coolant circulates in the refrigeration coil 6, and the coolant cools the water in the water tank through the refrigeration coil 6. The coolant can be external circulating cooling water or other cooling media.

[0032] The filtering container 2 is installed in the water tank 1 and is used to filter the cooling water sent from the circulating water inlet 3 and the cooling water circulation circuit. There are no strict requirements for the installation position of the filtering container 2. It can be installed on the upper left side, upper right side, upper side of the middle part, the center of the water tank 1 or other positions of the water tank 1. In this embodiment, the filtering container 2 is installed on the upper left side of the water tank 1, which is convenient for connecting the pipelines of each circuit, and is close to the refrigeration coil 6 and far from the purified water outlet 4, providing sufficient cooling time for the circulating water.

[0033] The filtering container 2 is a filter box, and a first filter screen 7 which is basically horizontal is installed in the filter box and is used to filter the dirt sent by the cooling water circulation circuit and concentrate the dirt into the pre-filtering circuit.

[0034] At least one second filter screen 8 is vertically installed in the water tank 1. The second filter screen 8 divides the water tank into a primary filtering area 9 and a secondary filtering area 10. The filter box and the refrigeration coil 6 are both located in the primary filtering area 9, and the purified water outlet 4 is located in the secondary filtering area 10. The second filter screen 8 filters the circulating water in the primary filtering area 9 again, improving the cleanliness of the cooling water. The second filter screen 8 is detachably installed in the water tank. For example, a clamping groove can be arranged on the side wall of the water tank 1, and the second filter screen 8 is clamped in the clamping groove, or the second filter screen 8 is fixed in the water tank with bolts, which is convenient to take out the second filter screen 8 from the water tank for cleaning.

[0035] The water pump 11 of the cooling water circulation circuit pumps the purified water flowing out of the purified water outlet 4 to the first filter 12 for fine filtration, and then sends it into the water-using equipment for recycling.

[0036] Specifically, the cooling water circulation loop includes a fourth pipeline 13, a water pump 11, a sixth pipeline 14, a first filter 12, and a sewage pipe 15 that are connected in sequence. The fourth pipeline 13 is connected to the purified water outlet 4 of the water tank, and one end of the sewage pipe 15 is connected to the sewage interface of the first filter 12 and the other end is connected to the filtering container 2; the sewage pipe 15 sends the sewage in the first filter 12 into the filtering container 2 for filtration, and the filtered dirt accumulates in the pre-filter. The water outlet 16 of the first filter is connected to the water-using equipment to realize the recycling of clean cooling water.

[0037] The pre-filtering loop is used to pre-filter the sewage in the filtering container 2 and then send it into the water pump 11, where it is incorporated into the cooling water circulation loop for use by the water-using equipment.

[0038] Specifically, the pre-filtering loop includes a pre-filter 17 and a first pipeline 18, a first valve 19, a second pipeline 20, a second valve 21, and a third pipeline 22 that are connected in sequence.

[0039] A sewage outlet 23 is provided on the first filter screen. The water inlet end of the first pipeline 18 is located below the first filter screen 7 and fixed on the sewage outlet 23. The dirt deposited on the first filter screen 7 flows into the first pipeline 18 and then enters the pre-filter 17 for filtration.

[0040] The pre-filter 17 is installed on the second pipeline 20, and the water outlet end of the third pipeline 22 is connected to the water inlet of the water pump 11; the first valve 19 and the second valve 21 are respectively installed at both ends of the second pipeline 20, that is, upstream and downstream of the pre-filter 17. When cleaning the pre-filter 17, the first valve 19 and the second valve 21 can be closed, and the pre-filter 17 can be disassembled from the second pipeline 20 to achieve cleaning without shutting down the machine.

[0041] For equipment or molds with different water consumption, the components of this equipment can be reduced or enlarged. For example: small automatic precision filtering chillers are for single equipment or molds, and medium and large automatic precision filtering chillers can be used for multiple equipment or molds at the same time, such as for the precision filtering of the water outlet of cooling towers.

[0042] The working principle of this equipment is as follows:

[0043] The cooling water used by the water-using equipment enters the filter tank through the circulating water inlet 3. The first filter screen 7 filters the cooling water for the first time, then it is cooled by the refrigeration coil 6, and then filtered again by the second filter screen 8, and flows out of the water tank through the purified water outlet 4;

[0044] The purified water flowing out of the purified water outlet 4 is pumped by the water pump 11 through the fourth pipeline 13 and the sixth pipeline 14 into the first filter 12 for a second filtration, and then sent back to the water-using equipment again.

[0045] The sewage deposited in the first filter 12 is sent into the filter tank through the sewage discharge pipe 15 and filtered again by the first filter screen. The purified water after filtration is reused through the above cooling water circulation loop. The sewage deposited on the first filter screen is discharged through the first pipeline 18 installed at the bottom of the first filter screen, sent to the pre-filter screen for filtration, and then pumped into the first filter by a water pump for re-filtration. The purified water obtained is conveyed to the water-using equipment.

[0046] Embodiment 2

[0047] The difference between this embodiment and Embodiment 1 is that the cooling water circulation loop further includes a manual sewage discharge branch and an automatic sewage discharge branch connected in parallel between the sewage interface of the first filter and the sewage discharge pipe. A manual sewage discharge switch 24 is installed on the manual sewage discharge branch, and a solenoid valve 25 is installed on the automatic sewage discharge branch. Therefore, the connection or disconnection between the first filter 12 and the sewage discharge pipe 15 can be controlled through the manual sewage discharge switch 24 or the solenoid valve 25. For example, when the cleanliness inside the first filter 12 is relatively high, the sewage discharge pipe 15 is disconnected. The manual sewage discharge branch or the automatic sewage discharge branch can be selected according to the actual production situation.

[0048] Other structures of this embodiment are the same as those of Embodiment 1.

[0049] Embodiment 3

[0050] As Figure 3 shown, the difference between this embodiment and Embodiment 1 is that a sewage inlet 26 is installed above the first filter screen 7 on the side wall of the filter tank. The sewage inlet 26 is far from the sewage outlet 23 and is basically on the same straight line as the sewage outlet 23 and opposite to the sewage outlet 23. The end of the sewage discharge pipe 15 is fixedly installed on the sewage inlet 26. The sewage discharge pipe 15 sends sewage into the filter tank through the sewage inlet 26. Since the sewage inlet 26 is far from the sewage outlet 23 and is arranged opposite to the sewage outlet 23, the water pressure in the sewage discharge pipe 15 can wash the dirt deposited on the first filter screen 7 into the sewage outlet 23 for discharge, avoiding blockage of the first filter screen 7 and eliminating the need for frequent manual cleaning of the first filter screen 7.

[0051] A horizontal stabilizing plate 27 is also installed at the bottom of the filter tank. A number of small holes with a pore diameter of about 2 - 4 mm are arranged in an array on the stabilizing plate 27. These holes are used for the filtered water to flow out of the filter tank in a steady flow, preventing the water flow in the filter tank from fluctuating.

[0052] The first filter screen 7 of the filter tank of this equipment can be disassembled from the filter tank, which is convenient for cleaning the first filter screen.

[0053] A water level observation pipe 28 can also be installed on the water tank, and a liquid level sensor 29 is installed on the water level observation pipe 28 to monitor the water level in the water tank 1 in real time, preventing the water pump 11 from being damaged due to dry pumping.

[0054] Embodiment 4

[0055] The difference between this embodiment and Embodiment 1 is that a fourth pipeline 13 and a fifth pipeline 30 are connected in parallel to the purified water outlet 4 through a three-way regulating valve. The fourth pipeline 13 is connected to a water pump 11, and the fifth pipeline 30 is connected to an evaporator 31. The evaporator 31 is connected to the water inlet of the water pump 11 through a seventh pipeline 32. The evaporator 31, a compressor 33, and a condenser 34 are connected to form a compression refrigeration unit capable of cooling purified water. This compression refrigeration unit is a water-cooled compression refrigeration unit, and the condenser 34 is a double-pipe condenser. External circulating cooling water is introduced into the condenser 34 to cool the condenser. The evaporator is a plate evaporator, and a filter is also connected between the compressor 33 and the condenser 34. The purified water can be distributed and flow into the fourth pipeline 13 and the fifth pipeline 30, that is: a part directly flows into the water pump 11, and the other part is first cooled by the evaporator 31 and then flows into the water pump 11. The water flow rates into the fourth pipeline 13 and the fifth pipeline 30 can be adjusted according to the working conditions to achieve precise control of the refrigeration temperature of the circulating water.

[0056] The refrigeration coil 6 or the compression refrigeration unit can be used alone to refrigerate the circulating water, or the refrigeration coil 6 and the compression refrigeration unit can be selected simultaneously for refrigeration, depending on the working conditions.

[0057] The other structures of this embodiment are the same as those of Embodiment 1.

[0058] Embodiment 5

[0059] The difference between this embodiment and Embodiment 1 is that a dosing device 35 is further configured. The dosing device 35 is connected to the water tank through a dosing pipeline 36. A neutral scale inhibitor and slow-release bactericide is stored in the dosing device 35. The dosing device 35 is provided with a timer to automatically add the bactericide to the water tank 1 at regular intervals, so that water-using equipment, molds, etc. will not scale. The other structures of this embodiment are the same as those of Embodiment 1.

[0060] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic precision filtering chiller, characterized in that, it includes: A water tank, which is provided with a circulating water inlet and a purified water outlet; a water-using device is connected to the circulating water inlet; the cooling water used by the water-using device is transported into the water tank for filtration and cooling, and then flows out of the water tank from the purified water outlet; A filtering container, installed in the water tank, for filtering the cooling water sent in from the circulating water inlet; A cooling water circulation circuit, the water pump of the cooling water circulation circuit pumps the purified water flowing out of the purified water outlet to a first filter for fine filtration, and then sends it into the water-using device for recycling; A pre-filtering circuit, used to pre-filter the sewage in the filtering container and then send it into the water pump, and then merge into the cooling water circulation circuit; The pre-filtering circuit includes a pre-filter and a first pipeline, a first valve, a second pipeline, a second valve and a third pipeline connected in sequence. The pre-filter is installed on the second pipeline. The water inlet end of the first pipeline is inserted into the filtering container, and the water outlet end of the third pipeline is connected to the water inlet of the water pump; the first valve and the second valve are respectively located at both ends of the second pipeline. Close the first valve and the second valve, and disassemble the pre-filter from the second pipeline; The cooling water circulation circuit further includes a sewage discharge pipe, one end of the sewage discharge pipe is connected to the sewage interface of the first filter, and the other end is connected to the filtering container; the sewage discharge pipe sends the sewage in the first filter into the filtering container for filtration, and the filtered dirt accumulates in the pre-filter; The filtering container is a filter box, a first filter screen is installed in the filter box, a sewage discharge port is provided on the first filter screen, and the water inlet end of the first pipeline is located below the first filter screen and fixed on the sewage discharge port; A horizontal pressure stabilizing plate is further installed at the bottom of the filter box. The pressure stabilizing plate is provided with a number of holes in an array, and the hole diameter is 2-4 mm. The holes are used to stabilize the filtered water and then flow out of the filter box.

2. The automatic precision filtering chiller according to claim 1, characterized in that, The cooling water circulation circuit further includes a manual sewage discharge branch and an automatic sewage discharge branch connected in parallel between the sewage interface of the first filter and the sewage discharge pipe. A manual sewage discharge switch is installed on the manual sewage discharge branch, and a solenoid valve is installed on the automatic sewage discharge branch.

3. The automatic precision filtering chiller according to claim 1, characterized in that, A sewage inlet is installed on the side wall of the filter box above the first filter screen, and the sewage inlet is far from the sewage discharge port; the end of the sewage discharge pipe is fixed on the sewage inlet.

4. The automatic precision filtering chiller according to claim 1, characterized in that, At least one second filter screen is installed in the water tank. The second filter screen is detachably installed. The second filter screen divides the water tank into a preliminary filtration area and a secondary filtration area. The filtering container is located in the preliminary filtration area, and the purified water outlet is located in the secondary filtration area.

5. The automatic precision filtering chiller according to claim 1, characterized in that, A refrigeration coil is further installed in the water tank for cooling the circulating water.

6. The automatic precision filtering chiller according to any one of claims 1 to 5, characterized in that, A fourth pipeline and a fifth pipeline are connected in parallel to the water purification outlet through a three-way regulating valve. The fourth pipeline is connected to the water pump, the fifth pipeline is connected to the evaporator, and the evaporator is connected to the water inlet of the water pump. The evaporator is connected to the compressor and the condenser to form a compression refrigeration unit capable of cooling the purified water.

Images