Freezing dryer with filter backwashing function

Abstract

The utility model discloses a refrigeration dryer with a filter backwashing function, which comprises a refrigeration dryer body, a cooling water inlet pipe, a cooling water return pipe, a filter, a first three-way valve, a second three-way valve, a reflux pipe, a first valve, a second valve, a third valve, a fourth valve and a drain pipe, the first three-way valve is connected between the water inlet of the cooling water inlet pipe and the filter; the second three-way valve is connected to the cooling water return pipe; two ends of the reflux pipe are respectively connected with the first three-way valve and the second three-way valve; the first valve is mounted on the reflux pipe; the second valve is mounted between the first three-way valve on the cooling water inlet pipe and the filter; the third valve is arranged between the water outlet of the cooling water return pipe and the second three-way valve; a water inlet of the drainage pipe is connected with a drainage position of the filter end cover mounting position; the fourth valve is installed on the drainage pipe. Under the condition that the original functions of the freezing dryer are guaranteed, backwashing of the filter is achieved, operation is convenient, and time and labor are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of cold dryers, in particular to a cold dryer with a backwash filter function. Background Art

[0002] The air compression system is an important equipment in the production workshop, and the cold dryer is an important equipment in the air compression system that cools the compressed air. If the cold dryer stops, the temperature of the compressed air generated will continue to rise, which will have a great impact on the workshop production process. The air compression system in the existing technology uses cooling water for cooling. Because it uses an open cooling tower, there will be impurities in the cooling water, which will cause the filter to become clogged, resulting in insufficient cooling water flow, causing the cold dryer plate heat exchanger to be ineffective, and the inlet water temperature to be too high, causing the cold dryer to stop. Every time it stops, maintenance personnel need to manually clean the filter before resuming use. Excessive impurities in the cooling water will frequently cause the filter to become clogged, causing the cold dryer to stop frequently. Frequent starting and stopping of the cold dryer can cause damage to the compressor. At this stage, operators are required to clean the filter every night, which is time-consuming, labor-intensive, and difficult to clean. Utility Model Content

[0003] In order to solve at least one aspect of the above problems, the present invention provides a cold dryer with a backwash filter function. When the cold dryer body is working, the cooling water flows along the cooling water inlet pipe through the second valve to the filter for filtration, and then flows into the cold dryer body. The cooling water in the cold dryer body flows out along the cooling water return pipe through the third valve to achieve cooling of the cold dryer body; when backwashing, the cooling water passes through the first valve along the cooling water inlet pipe and the backflow pipe, flows back into the cold dryer body along the cooling water return pipe, and then flows out of the cold dryer body and flows back along the cooling water inlet pipe to the filter for backwashing the filter, and then is discharged along the drain pipe through the fourth valve. While ensuring the original function of the cold dryer, the filter is flushed. The operation of cleaning the filter in this application is convenient, time-saving and labor-saving.

[0004] The present application is realized through the following technical solutions: a cold dryer with a backwash filter function, comprising a cold dryer body, a cooling water inlet pipe, a cooling water return pipe and a filter, the outlet of the cooling water inlet pipe is connected and communicated with the cooling water inlet of the cold dryer body, the inlet of the cooling water return pipe is connected and communicated with the cooling water outlet of the cold dryer body, and the filter is installed in the cooling water inlet pipe; further comprising a first three-way valve, a second three-way valve, a backflow pipe, a first valve, a second valve, a third valve, a fourth valve and a drain pipe; the first three-way valve is connected and communicated between the water inlet of the cooling water inlet pipe and the filter; the second three-way valve is connected And it is connected to the cooling water return pipe; the water inlet of the reflux pipe is connected to and connected with the first three-way valve, and the water outlet of the reflux pipe is connected to and connected with the second three-way valve; the first valve is installed on the reflux pipe; the second valve is installed between the first three-way valve and the filter on the cooling water inlet pipe; the third valve is installed between its outlet and the second three-way valve on the cooling water return pipe; the water inlet of the drain pipe is connected to and connected with the drain at the installation point of the filter end cover; the fourth valve is installed on the drain pipe; when the cold dryer body is working, the first valve and the fourth valve are closed, and the second valve and the third valve are opened; when backwashing, the first valve and the fourth valve are opened, and the second valve and the third valve are closed.

[0005] Preferably, a controller is further included, which is communicatively connected to the first valve, the second valve, the third valve, and the fourth valve, and is used to control the opening and closing of the first valve, the second valve, the third valve, and the fourth valve.

[0006] Preferably, the controller is communicatively connected to the cold dryer body for obtaining the working status signal of the cold dryer body; the controller includes a backwash module, and the backwash module includes an automatic flushing unit for controlling the first valve and the fourth valve to close and the second valve and the third valve to open when the cold dryer body is working; when the cold dryer body is shut down, the first valve and the fourth valve to open and the second valve and the third valve to close.

[0007] Preferably, the controller further comprises a timing unit, which is in communication with the automatic flushing unit and is used to control the start time and duration of the automatic flushing unit.

[0008] Preferably, it also includes a touch screen, which is communicatively connected to the controller and is used to select the operating mode in the controller and input manual flushing instructions. When the automatic flushing mode is selected on the touch screen and the cold dryer body is working, the first valve and the fourth valve are controlled to be closed, and the second valve and the third valve are controlled to be opened; when the automatic flushing mode is selected on the touch screen and the cold dryer body is stopped, the first valve and the fourth valve are controlled to be opened, and the second valve and the third valve are controlled to be closed; the backwash module also includes a manual flushing unit, which is used to control the first valve and the fourth valve to be closed, and the second valve and the third valve to be opened when the manual flushing mode is selected on the touch screen and the manual flushing start instruction is input, and the cold dryer body is working; when the manual flushing mode is selected on the touch screen and the manual flushing start instruction is input, and the cold dryer body is stopped, the first valve and the fourth valve are controlled to be opened, and the second valve and the third valve are closed.

[0009] Preferably, it also includes a touch screen, which is communicatively connected to the controller and is used to control the opening and closing of the first valve, the second valve, the third valve, and the fourth valve through the controller.

[0010] Preferably, a fifth valve is connected to the cooling water inlet pipe, and the fifth valve is located between the water inlet on the cooling water inlet pipe and the first three-way valve; a sixth valve is connected to the cooling water return pipe, and the sixth valve is located between the water outlet on the cooling water return pipe and the third valve; the fifth valve and the sixth valve are both communicatively connected to the controller for controlling the opening and closing of the fifth valve and the sixth valve.

[0011] Preferably, the controller is communicatively connected to the cold dryer body, and the controller includes a backwash module. When the cold dryer body is shut down and the backwash module is not running, the controller controls at least the fifth valve and the sixth valve to close; when the cold dryer body is working, the controller controls the second valve, the third valve, the fifth valve and the sixth valve to open, and the first valve and the fourth valve to close.

[0012] Preferably, a first ball valve is installed on the reflux pipe.

[0013] Preferably, the first valve, the second valve, the third valve and the fourth valve are all solenoid valves.

[0014] The utility model provides a cold dryer with a backwash filter function, which has the following beneficial effects:

[0015] (1) By installing a reflux pipe between the cooling water inlet pipe and the cooling water return pipe of the original cold dryer, and installing a first valve on the reflux pipe, a second valve is installed on the side of the cooling water inlet pipe where it is connected to the reflux pipe and close to the cold dryer body, a third valve is installed on the side of the cooling water return pipe where it is connected to the reflux pipe and away from the cold dryer body, and a drain pipe with a fourth valve is installed on the filter. When the cold dryer body is working, the first valve and the fourth valve are closed, and the second valve and the third valve are opened. The cooling water flows along the cooling water inlet pipe through the second valve to the filter and then flows into the cold dryer body after being filtered. The cooling water flows out along the cooling water return pipe through the third valve to cool the cold dryer body; when backwashing, the first valve and the fourth valve are opened, and the second valve and the third valve are closed. The cooling water passes through the first valve along the cooling water inlet pipe and the backflow pipe, and flows back into the cold dryer body along the cooling water return pipe. After flowing out of the cold dryer body, it flows back along the cooling water inlet pipe to the filter to backwash the filter, and then is discharged along the drain pipe through the fourth valve. While ensuring the original function of the cold dryer, the filter is flushed. The operation of cleaning the filter in this application is convenient, time-saving and labor-saving.

[0016] (2) By setting a controller, the opening and closing of the first valve, the second valve, the third valve and the fourth valve are controlled, and an automatic flushing unit is set in the controller. When the automatic flushing unit is started, the backwashing does not run when the cold dryer body is working, and the backwashing starts when the cold dryer body is stopped; more preferably, a manual flushing unit is set in the controller. When the manual flushing unit is started, the staff manually inputs a manual flushing instruction, selects a manual flushing mode on the touch screen and inputs a manual flushing start instruction, and the backwashing does not run when the cold dryer body is working, selects a manual flushing mode on the touch screen and inputs a manual flushing start instruction, and the backwashing starts when the cold dryer body is stopped, thereby realizing automatic control of multiple valves, thereby realizing automatic and accurate control of the backwashing operation according to the operating status of the cold dryer body, saving more time and effort, and preventing the cooling water from flowing back when the cold dryer body is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To better understand the above and other objects, features, advantages, and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and do not limit the scope of the present invention in any way, and that the components in the drawings are not drawn to scale.

[0018] Figure 1 Shows a piping diagram of a cold dryer with a backwash filter function according to an embodiment of the present utility model;

[0019] Figure 2The figure shows a structural block diagram of a cold dryer with a backwash filter function according to an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1. Dryer body; 2. Cooling water inlet pipe; 3. Cooling water return pipe; 4. Filter; 5. First three-way valve; 6. Second three-way valve; 7. Reflux pipe; 8. First valve; 9. Second valve; 10. Third valve; 11. Fourth valve; 12. Drain pipe; 13. First ball valve; 14. Controller; 15. Touch screen; 16. Fifth valve; 17. First butterfly valve; 18. Second ball valve; 19. Sixth valve; 20. Second butterfly valve; 21. Third ball valve. DETAILED DESCRIPTION

[0022] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0023] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0024] In order to at least partially solve the above-mentioned problems and one or more of other potential problems, an embodiment of the present disclosure proposes a cold dryer with a backwash filter 4 function, including a cold dryer body 1, a cooling water inlet pipe 2, a cooling water return pipe 3 and a filter 4, the outlet of the cooling water inlet pipe 2 is connected and communicated with the cooling water inlet of the cold dryer body 1, the inlet of the cooling water return pipe 3 is connected and communicated with the cooling water outlet of the cold dryer body 1, and the filter 4 is installed in the cooling water inlet pipe 2; it also includes a first three-way valve 5, a second three-way valve 6, a backflow pipe 7, a first valve 8, a second valve 9, a third valve 10, a fourth valve 11 and a drain pipe 12; the first three-way valve 5 is connected and communicated between its water inlet on the cooling water inlet pipe 2 and the filter 4; the third three-way valve 5 is connected and communicated between the water inlet of the cooling water inlet pipe 2 and the filter 4; the fourth three-way valve 5 is connected and communicated between the water inlet of the cooling water inlet pipe 2 and the filter 4; the fourth three-way valve 5 is connected and communicated between the water inlet of the cooling water inlet pipe 2 and the filter 4; the third ... The second and third-way valves 6 are connected and communicated with the cooling water return pipe 3; the water inlet of the backflow pipe 7 is connected and communicated with the first three-way valve 5, and the water outlet of the backflow pipe 7 is connected and communicated with the second three-way valve 6; the first valve 8 is installed on the backflow pipe 7; the second valve 9 is installed between the first three-way valve 5 and the filter 4 on the cooling water inlet pipe 2; the third valve 10 is installed between its outlet and the second three-way valve 6 on the cooling water return pipe 3; the water inlet of the drain pipe 12 is connected and communicated with the drain at the installation point of the end cover of the filter 4; the fourth valve 11 is installed on the drain pipe 12; when the cold dryer body 1 is working, the first valve 8 and the fourth valve 11 are closed, and the second valve 9 and the third valve 10 are opened; when backwashing, the first valve 8 and the fourth valve 11 are opened, and the second valve 9 and the third valve 10 are closed.

[0025] Example 1:

[0026] In some existing technologies, the outlet of the cooling water inlet pipe 2 is connected and communicated with the cooling water inlet of the cold dryer body 1, the inlet of the cooling water return pipe 3 is connected and communicated with the cooling water outlet of the cold dryer body 1, and the filter 4 is installed on the side of the cooling water inlet pipe 2 close to the cold dryer body 1. When the cold dryer body 1 needs to be cooled, the cooling water flows along the cooling water inlet pipe 2 to the filter 4 for filtration and then flows into the cold dryer body 1. The cooling water in the cold dryer body 1 flows out along the cooling water return pipe 3.

[0027] In this application, if Figure 1As shown, a first three-way valve 5, a second three-way valve 6, a backflow pipe 7, a first valve 8, a second valve 9, a third valve 10, a fourth valve 11 and a drain pipe 12 are additionally provided on the existing cold dryer. The first valve 8, the second valve 9, the third valve 10 and the fourth valve 11 are preferably solenoid valves; the first three-way valve 5 is connected and communicated between its water inlet and the filter 4 on the cooling water inlet pipe 2; the second three-way valve 6 is connected and communicated with the cooling water return pipe 3; the water inlet of the backflow pipe 7 is connected and communicated with the first three-way valve 5, and the water outlet of the backflow pipe 7 is connected and communicated with the second three-way valve 6; the first valve 8 is installed on the backflow pipe 7, and preferably, a first ball valve 13 is installed on the backflow pipe 7, and the first ball valve 13 is connected in series with the first valve 8; the second valve 9 is installed between the first three-way valve 5 and the filter 4 on the cooling water inlet pipe 2; the third valve 10 is installed between the water outlet and the second three-way valve on the cooling water return pipe 3 between the valves 6; the water inlet of the drain pipe 12 is connected and communicated with the drain at the installation point of the end cover of the filter 4; the fourth valve 11 is installed on the drain pipe 12; when the cold dryer body 1 is working, the first valve 8 and the fourth valve 11 are closed, and the second valve 9 and the third valve 10 are opened, so that the cooling water flows along the cooling water inlet pipe 2 through the second valve 9 to the filter 4 for filtration and then flows into the cold dryer body 1, and the cooling water in the cold dryer body 1 flows out through the third valve 10 along the cooling water return pipe 3; when backwashing, the first valve 8 and the fourth valve 11 are opened, and the second valve 9 and the third valve 10 are closed, so that the cooling water flows along the cooling water inlet pipe 2, the reflux pipe 7, the first valve 8, and then along the cooling water return pipe 3 in the reverse direction into the cold dryer body 1, and then flows out of the cold dryer body 1 and flows back along the cooling water inlet pipe 2 to the filter 4 for backwashing the filter 4, and then is discharged along the drain pipe 12 through the fourth valve 11.

[0028] The opening and closing of the first valve 8, the second valve 9, the third valve 10 and the fourth valve 11 can be manually controlled, but there is a risk of misoperation. In some preferred embodiments, the cold dryer of the present application also includes a controller 14, which is communicatively connected to the first valve 8, the second valve 9, the third valve 10 and the fourth valve 11, and is used to control the opening and closing of the first valve 8, the second valve 9, the third valve 10 and the fourth valve 11, and the opening and closing of each valve is manually or automatically centrally controlled by the controller 14; in some embodiments, the cold dryer of the present application also includes a touch screen 15, which is communicatively connected to the controller 14, and is used to control the opening and closing of the first valve 8, the second valve 9, the third valve 10 and the fourth valve 11 through the controller 14, and a method for manually controlling the controller 14 is disclosed.

[0029] In other preferred embodiments, Figure 2As shown, the controller 14 is communicatively connected to the cold dryer body 1 for obtaining the working status signal of the cold dryer body 1; the controller 14 includes a backwash module, and the backwash module includes an automatic flushing unit for controlling the first valve 8 and the fourth valve 11 to be closed, and the second valve 9 and the third valve 10 to be opened when the cold dryer body 1 is working; when the cold dryer body 1 is shut down, the first valve 8 and the fourth valve 11 are controlled to be opened, and the second valve 9 and the third valve 10 are closed; preferably, the controller 14 also includes a timing unit, which is communicatively connected to the automatic flushing unit for controlling the opening time and opening duration of the automatic flushing unit.

[0030] More preferably, the cold dryer of the present application further includes a touch screen 15, which is communicatively connected to the controller 14 and is used to select an operating mode in the controller 14 and input a manual flushing instruction. When the automatic flushing mode is selected on the touch screen 15 and the cold dryer body 1 is working, the first valve 8 and the fourth valve 11 are controlled to be closed, and the second valve 9 and the third valve 10 are controlled to be open; when the automatic flushing mode is selected on the touch screen 15 and the cold dryer body 1 is shut down, the first valve 8 and the fourth valve 11 are controlled to be open, and the second valve 9 and the third valve 10 are closed; the backwash module further includes a manual flushing unit for when the manual flushing mode is selected on the touch screen 15 and the manual flushing start instruction is input, and the cold dryer body 1 is working , controlling the first valve 8 and the fourth valve 11 to close, and the second valve 9 and the third valve 10 to open; when the manual flushing mode is selected on the touch screen 15 and the manual flushing opening instruction is input, and the cold dryer body 1 is shut down, controlling the first valve 8 and the fourth valve 11 to open, and the second valve 9 and the third valve 10 to close; when the manual flushing mode is selected on the touch screen 15 and the manual flushing closing instruction is input, and the cold dryer body 1 is operating, controlling the first valve 8 and the fourth valve 11 to close, and the second valve 9 and the third valve 10 to open; when the manual flushing mode is selected on the touch screen 15 and the manual flushing closing instruction is input, and the cold dryer body 1 is shut down, controlling the first valve 8, the second valve 9, the third valve 10, and the fourth valve 11 to close. Automatically and accurately controlling the backwashing operation according to the operating status of the cold dryer body 1 saves time and effort, and prevents the cooling water from flowing back when the cold dryer body 1 is operating.

[0031] Example 2:

[0032] The difference from Example 1 is that: Figure 1 and Figure 2As shown, in some prior arts, the cooling water inlet pipe 2 is connected with a fifth valve 16, a first butterfly valve 17 and a second ball valve 18. The fifth valve 16 is preferably a solenoid valve. The fifth valve 16, the first butterfly valve 17 and the second ball valve 18 are sequentially arranged along the cooling water inlet pipe 2 from the water inlet to the water outlet in the direction between the water inlet on the cooling water inlet pipe 2 and the filter 4. Preferably, the first three-way valve 5 in the present application is connected between the filter 4 on the cooling water inlet pipe 2 and the second ball valve 18; the cooling water return pipe 3 is connected to a sixth valve 19, a second butterfly valve 20 and a third ball valve 21. The sixth valve 19 is preferably a solenoid valve. The sixth valve 19, the second butterfly valve 20 and the third ball valve 21 are arranged in sequence on the cooling water return pipe 3 from the water outlet to the water inlet. Preferably, the second three-way valve 6 in this application is connected between the second butterfly valve 20 and the third ball valve 21 on the cooling water return pipe 3, and the third valve 10 is connected between the second butterfly valve 20 and the second three-way valve 6 on the cooling water return pipe 3.

[0033] Preferably, the cold dryer in the present application includes a controller 14, and the fifth valve 16 and the sixth valve 19 are both communicated with the controller 14 for controlling the opening and closing of the fifth valve 16 and the sixth valve 19; more preferably, the controller 14 is communicated with the cold dryer body 1, and the controller 14 includes a backwash module. When the cold dryer body 1 is shut down and the backwash module is not running, the controller 14 at least controls the fifth valve 16 and the sixth valve 19 to close, and preferably controls the first valve 8, the second valve 9, the third valve 10, the fourth valve 11, the fifth valve 1 6 and the sixth valve 19 are all closed; when the cold dryer body 1 is working, the controller 14 controls the second valve 9, the third valve 10, the fifth valve 16 and the sixth valve 19 to be open, and the first valve 8 and the fourth valve 11 to be closed; when the automatic flushing mode is selected on the touch screen 15 and the cold dryer body 1 is working, the first valve 8 and the fourth valve 11 are controlled to be closed, and the second valve 9, the third valve 10, the fifth valve 16 and the sixth valve 19 are opened; when the automatic flushing mode is selected on the touch screen 15 and the cold dryer body 1 is stopped, the first valve 8 and the fourth valve 11 are controlled to be closed. 11, the fifth valve 16 and the sixth valve 19 are opened, and the second valve 9 and the third valve 10 are closed; when the manual flushing mode is selected on the touch screen 15 and the manual flushing opening instruction is input, and the cold dryer body 1 is working, the first valve 8 and the fourth valve 11 are controlled to be closed, and the second valve 9, the third valve 10, the fifth valve 16 and the sixth valve 19 are opened; when the manual flushing mode is selected on the touch screen 15 and the manual flushing opening instruction is input, and the cold dryer body 1 is stopped, the first valve 8, the fourth valve 11, the fifth valve 16 and the sixth valve 19 are controlled The first valve 8 and the fourth valve 11 are controlled to be closed, and the second valve 9, the third valve 10, the fifth valve 16 and the sixth valve 19 are controlled to be opened; when the manual flushing mode is selected on the touch screen 15 and the manual flushing closing command is input, and the cold dryer body 1 is working, the first valve 8 and the fourth valve 11 are controlled to be closed, and the second valve 9, the third valve 10, the fifth valve 16 and the sixth valve 19 are controlled to be opened; when the manual flushing mode is selected on the touch screen 15 and the manual flushing closing command is input, and the cold dryer body 1 is stopped, the first valve 8, the second valve 9, the third valve 10, the fourth valve 11, the fifth valve 16 and the sixth valve 19 are controlled to be closed.

[0034] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand this document.

Claims

1. A cold dryer with a backwash filter function, comprising a cold dryer body (1), a cooling water inlet pipe (2), a cooling water return pipe (3) and a filter (4), wherein the outlet of the cooling water inlet pipe (2) is connected and communicated with the cooling water inlet of the cold dryer body (1), the inlet of the cooling water return pipe (3) is connected and communicated with the cooling water outlet of the cold dryer body (1), and the filter (4) is installed in the cooling water inlet pipe (2), characterized in that: It also includes a first three-way valve (5), a second three-way valve (6), a backflow pipe (7), a first valve (8), a second valve (9), a third valve (10), a fourth valve (11) and a drain pipe (12); The first three-way valve (5) is connected and communicated between the water inlet of the cooling water inlet pipe (2) and the filter (4); The second three-way valve (6) is connected to and communicates with the cooling water return pipe (3); The water inlet of the reflux pipe (7) is connected to and communicates with the first three-way valve (5), and the water outlet of the reflux pipe (7) is connected to and communicates with the second three-way valve (6); The first valve (8) is installed on the reflux pipe (7); The second valve (9) is installed between the first three-way valve (5) and the filter (4) on the cooling water inlet pipe (2); The third valve (10) is installed on the cooling water return pipe (3) between its outlet and the second three-way valve (6); The water inlet of the drain pipe (12) is connected and communicated with the drain outlet of the end cover installation location of the filter (4); The fourth valve (11) is installed on the drain pipe (12); When the cold dryer body (1) is in operation, the first valve (8) and the fourth valve (11) are closed, and the second valve (9) and the third valve (10) are opened; when backwashing is performed, the first valve (8) and the fourth valve (11) are opened, and the second valve (9) and the third valve (10) are closed.

2. The cold dryer with backwash filter function according to claim 1, characterized in that: The invention also includes a controller (14), which is in communication with the first valve (8), the second valve (9), the third valve (10), and the fourth valve (11) and is used to control the opening and closing of the first valve (8), the second valve (9), the third valve (10), and the fourth valve (11).

3. The cold dryer with backwash filter function according to claim 2, characterized in that: The controller (14) is in communication connection with the cold dryer body (1) and is used to obtain an operating status signal of the cold dryer body (1); the controller (14) includes a backwash module, and the backwash module includes an automatic flushing unit, which is used to control the first valve (8) and the fourth valve (11) to be closed and the second valve (9) and the third valve (10) to be opened when the cold dryer body (1) is working; and to control the first valve (8) and the fourth valve (11) to be opened and the second valve (9) and the third valve (10) to be closed when the cold dryer body (1) is stopped.

4. The cold dryer with backwash filter function according to claim 3, characterized in that: The controller (14) further comprises a timing unit, which is in communication with the automatic flushing unit and is used to control the start time and duration of the automatic flushing unit.

5. The cold dryer with backwash filter function according to claim 3, characterized in that: The device further comprises a touch screen (15), the touch screen (15) being in communication connection with the controller (14) and being used for selecting an operating mode in the controller (14) and inputting a manual flushing instruction. When the automatic flushing mode is selected on the touch screen (15) and the cold dryer body (1) is in operation, the first valve (8) and the fourth valve (11) are controlled to be closed, and the second valve (9) and the third valve (10) are controlled to be opened; when the automatic flushing mode is selected on the touch screen (15) and the cold dryer body (1) is stopped, the first valve (8) and the fourth valve (11) are controlled to be opened, and the second valve (9) and the third valve (10) are controlled to be closed. The three valves (10) are closed; the backwash module further comprises a manual flushing unit, which is used for controlling the first valve (8) and the fourth valve (11) to be closed, and the second valve (9) and the third valve (10) to be opened when the manual flushing mode is selected on the touch screen (15) and the manual flushing start instruction is input, and the cold dryer body (1) is working; and controlling the first valve (8) and the fourth valve (11) to be opened, and the second valve (9) and the third valve (10) to be closed when the manual flushing mode is selected on the touch screen (15) and the manual flushing start instruction is input, and the cold dryer body (1) is stopped.

6. The cold dryer with backwash filter function according to claim 2, characterized in that: The invention also includes a touch screen (15), which is in communication with the controller (14) and is used to control the opening and closing of the first valve (8), the second valve (9), the third valve (10), and the fourth valve (11) through the controller (14).

7. A cold dryer with a backwash filter function according to any one of claims 2 to 6, characterized in that: The cooling water inlet pipe (2) is connected to a fifth valve (16), which is located between the water inlet on the cooling water inlet pipe (2) and the first three-way valve (5); the cooling water return pipe (3) is connected to a sixth valve (19), which is located between the water outlet on the cooling water return pipe (3) and the third valve (10); the fifth valve (16) and the sixth valve (19) are both connected to a controller (14) for communication and for controlling the opening and closing of the fifth valve (16) and the sixth valve (19).

8. The cold dryer with backwash filter function according to claim 7, characterized in that: The controller (14) is in communication connection with the cold dryer body (1), and the controller (14) includes a backwash module. When the cold dryer body (1) is shut down and the backwash module is not running, the controller (14) controls at least the fifth valve (16) and the sixth valve (19) to be closed; when the cold dryer body (1) is running, the controller (14) controls the second valve (9), the third valve (10), the fifth valve (16) and the sixth valve (19) to be opened, and the first valve (8) and the fourth valve (11) to be closed.

9. The cold dryer with backwash filter function according to claim 1, characterized in that: A first ball valve (13) is installed on the reflux pipe (7).

10. The cold dryer with backwash filter function according to claim 1, characterized in that: The first valve (8), the second valve (9), the third valve (10) and the fourth valve (11) are all solenoid valves.

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