A closed drying machine and a method for calculating dehumidification capacity thereof

Abstract

The present invention relates to the technical field of closed dryer equipment, and in particular to a closed dryer and a method for calculating the dehumidification capacity thereof. The device comprises a compressor, a condenser, a throttle valve, an evaporator, a first pipe, a second pipe and a third pipe; the first pipe connects the outlet end of the compressor with the inlet end of the condenser, the second pipe connects the outlet end of the condenser with the inlet end of the evaporator, and the third pipe connects the outlet end of the evaporator with the inlet end of the compressor; the throttle valve is arranged on the second pipe; the technical solution automatically obtains multiple pressure values ​​and temperature values ​​by arranging multiple pressure detection devices and multiple temperature detection devices on the refrigerant system of the closed dryer, thereby calculating the refrigerant parameters, and then calculating the heat exchange capacity of the condenser, the compressor power, the cooling capacity, the system air volume, the sensible heat and latent heat of the evaporator, and gradually calculating the dehumidification capacity of the system.

Description

Technical Field

[0001] The invention relates to the technical field of closed dryer equipment, and in particular to a closed dryer and a dehumidification capacity calculation method thereof. Background Art

[0002] At present, heat pump closed dryers are widely used in the field of drying and dehumidification because of their stable operation and freedom from environmental influence. Closed dryers mainly dehumidify air. During use, it is inconvenient to measure the dehumidification amount under different conditions. Generally, condensed water is manually collected and weighed, which is time-consuming and labor-intensive and not sustainable. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide a closed dryer, on which a plurality of pressure and temperature detection devices are arranged on the refrigerant system to obtain corresponding pressure and temperature values, and then the relevant parameters are calculated by the built-in function, and the dehumidification capacity of the closed dryer is calculated by step-by-step calculation.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: comprising a compressor, a condenser, a throttle valve, an evaporator, a first pipeline, a second pipeline and a third pipeline; the first pipeline connects the outlet end of the compressor with the inlet end of the condenser, the second pipeline connects the outlet end of the condenser with the inlet end of the evaporator, and the third pipeline connects the outlet end of the evaporator with the inlet end of the compressor; the throttle valve is arranged on the second pipeline;

[0005] A first pressure sensor is connected to the first pipeline at the outlet of the compressor, and a second pressure sensor is connected to the third pipeline at the inlet of the compressor;

[0006] A first temperature sensor is provided on the first pipe at the outlet end of the compressor, a second temperature sensor is provided on the third pipe at the inlet end of the compressor, a third temperature sensor is provided on the second pipe at the outlet end of the condenser, a fourth temperature sensor is provided at the air inlet of the evaporator, a fifth temperature sensor is provided at the outlet end of the evaporator connected to the inlet end of the condenser, and a sixth temperature sensor is provided at the outlet air of the condenser.

[0007] A method for calculating the dehumidification amount of a closed dryer is characterized by: collecting a first pressure P1 on a first pressure sensor, a second pressure P2 on a second pressure sensor, a temperature T1 on a first temperature sensor, a temperature T2 on a second temperature sensor, a temperature T3 on a third temperature sensor, a temperature T4 on a fourth temperature sensor, a temperature T5 on a fifth temperature sensor, and a temperature T6 on a sixth temperature sensor.

[0008] Preferably, the suction and exhaust enthalpy values ​​h1 and h2 of the compressor are calculated from P1, T1 and P2, T2 to obtain the suction specific volume, and the refrigerant mass G is calculated based on the compressor displacement to obtain the compressor power P=h2-h1*G.

[0009] Preferably, the enthalpy value h3 at the outlet of the condenser is calculated from P1 and T3, and the heat exchange amount of the condenser is qc=h3-h1*G.

[0010] Preferably, the air volume V of the condenser is calculated by qc, T5, and T6, then V=qc / (T6-T5) / CP1, wherein CP1 is the constant-pressure specific heat of the air in the condenser.

[0011] Preferably, the sensible heat qs of the evaporator is calculated from V, T4, and T5, then qs=V*(T4-T5)*CP2, wherein CP2 is the constant-pressure specific heat of the air in the evaporator.

[0012] Preferably, the latent heat ql of the evaporator is calculated, then ql=qc-p-qs.

[0013] Preferably, the dehumidification capacity m of the evaporator is calculated, then m=ql / (2500+(T4-T5)*CPW), CPW is the constant pressure specific heat of water in the evaporator.

[0014] The present invention adopts the above technical solution, which obtains multiple pressure values ​​and temperature values ​​by setting multiple pressure detection devices and multiple temperature detection devices on the refrigerant system of the closed dryer, thereby calculating the refrigerant parameters, and then calculating the heat exchange capacity of the condenser, the compressor power, the cooling capacity, the system air volume, the sensible heat and latent heat of the evaporator, and gradually calculating the dehumidification of the system. The dehumidification can be directly displayed on the display, and can be set by time to display the dehumidification at all times to meet the needs of the project. This solution effectively solves the time-consuming and labor-intensive, and unsustainable problems caused by the existing weighing method of manually receiving condensed water. By adopting an automatic calculation method, it realizes automatic display and recording of dehumidification, and the data can be remotely transmitted and displayed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a measurement system diagram for a closed dryer.

[0016] Figure 2 for Figure 1 Flow chart for calculating the dehumidification capacity of the closed dryer. DETAILED DESCRIPTION

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0022] like Figure 1A closed drying machine shown in the figure comprises a compressor 1, a condenser 2, a throttle valve 3, an evaporator 4, a first pipe 5, a second pipe 6 and a third pipe 7; the first pipe 5 connects the outlet end 8 of the compressor and the inlet end 9 of the condenser, the second pipe 6 connects the outlet end 10 of the condenser and the inlet end 11 of the evaporator, and the third pipe 7 connects the outlet end 12 of the evaporator and the inlet end 13 of the compressor; the throttle valve 3 is arranged on the second pipe 6;

[0023] A first pressure sensor 100 is connected to the first pipeline 5 at the outlet of the compressor 1, and a second pressure sensor 101 is connected to the third pipeline 7 at the inlet of the compressor 1;

[0024] A first temperature sensor 201 is provided on the first pipe 5 at the outlet end 8 of the compressor, a second temperature sensor 202 is provided on the third pipe 7 at the inlet end 13 of the compressor, a third temperature sensor 203 is provided on the second pipe 6 at the outlet end 10 of the condenser, a fourth temperature sensor 204 is provided at the air inlet of the evaporator 4, a fifth temperature sensor 205 is provided at the outlet end 12 of the evaporator connected to the inlet end 9 of the condenser, and a sixth temperature sensor 206 is provided at the outlet air of the condenser 2.

[0025] like Figure 2 A method for calculating the dehumidification amount of a closed dryer is shown: collecting a first pressure P1 on a first pressure sensor 100, a second pressure P2 on a second pressure sensor 101, a temperature T1 on a first temperature sensor 201, a temperature T2 on a second temperature sensor 202, a temperature T3 on a third temperature sensor 203, a temperature T4 on a fourth temperature sensor 204, a temperature T5 on a fifth temperature sensor 205, and a temperature T6 on a sixth temperature sensor 206.

[0026] Furthermore, the suction and exhaust enthalpy values ​​h1 and h2 of compressor 1 are calculated from P1, T1 and P2, T2 to obtain the suction specific volume. The refrigerant mass G is calculated based on the displacement of compressor 1 to obtain the power P=h2-h1*G of compressor 1.

[0027] Furthermore, the enthalpy value h3 at the outlet of condenser 2 is calculated from P1 and T3, and the heat exchange amount of condenser 2 is qc=h3-h1*G.

[0028] Furthermore, the air volume V of the condenser 2 is calculated by qc, T5, and T6, and then V=qc / (T6-T5) / CP1, where CP1 is the constant-pressure specific heat of the air in the condenser 2.

[0029] Furthermore, the sensible heat qs of the evaporator 4 is calculated from V, T4, and T5, then qs=V*(T4-T5)*CP2, wherein CP2 is the constant-pressure specific heat of the air in the evaporator 4.

[0030] Furthermore, the latent heat ql of the evaporator 4 is calculated, and ql=qc-p-qs.

[0031] Furthermore, the dehumidification capacity m of the evaporator 4 is calculated, then m=ql / (2500+(T4-T5)*CPW), where CPW is the constant pressure specific heat of water in the evaporator 4.

[0032] In this specific embodiment, since the calculation of dehumidification by weighing the condensed water manually is time-consuming and labor-intensive, and unsustainable, this solution sets multiple pressure detection devices and multiple temperature detection devices on the refrigerant system of the closed dryer to obtain multiple pressure values ​​and temperature values, thereby calculating the refrigerant parameters in the system, and then calculating the heat exchange of the condenser 2, the compressor power, the cooling capacity, the system air volume, the sensible heat and latent heat of the evaporator 4 through the function, and gradually calculating the dehumidification of the system. The dehumidification can be directly displayed on the display, and can be displayed at any time through time settings to meet engineering needs. This solution realizes automatic display and recording of dehumidification through automatic calculation, and the data can be remotely transmitted and displayed.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0034] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A closed drying machine, characterized in that: The invention comprises a compressor (1), a condenser (2), a throttle valve (3), an evaporator (4), a first pipeline (5), a second pipeline (6) and a third pipeline (7); the first pipeline (5) connects the outlet end (8) of the compressor and the inlet end (9) of the condenser, the second pipeline (6) connects the outlet end (10) of the condenser and the inlet end (11) of the evaporator, and the third pipeline (7) connects the outlet end (12) of the evaporator and the inlet end (13) of the compressor; the throttle valve (3) is arranged on the second pipeline (6); A first pressure sensor (100) is connected to the first pipeline (5) at the outlet of the compressor (1), and a second pressure sensor (101) is connected to the third pipeline (7) at the inlet of the compressor (1); The first pipe (5) is provided with a first temperature sensor (201) at the outlet end (8) of the compressor, the third pipe (7) is provided with a second temperature sensor (202) at the inlet end (13) of the compressor, the second pipe (6) is provided with a third temperature sensor (203) at the outlet end (10) of the condenser, the air inlet of the evaporator (4) is provided with a fourth temperature sensor (204), the outlet end (12) of the evaporator is connected to the inlet end (9) of the condenser and is provided with a fifth temperature sensor (205), and the outlet air of the condenser (2) is provided with a sixth temperature sensor (206); The closed dryer also includes a calculation system, which can calculate the suction and exhaust enthalpy values ​​h1 and h2 of the compressor (1), the refrigerant mass G, the power P of the compressor (1), the enthalpy value h3 at the outlet of the condenser (2), the heat exchange amount qc of the condenser (2), the air inlet and outlet volume V of the condenser (2), the sensible heat amount qs of the evaporator (4), and the latent heat amount ql of the evaporator (4), and then calculate the dehumidification amount m of the evaporator (4); the dehumidification amount can be directly displayed on the display, and the dehumidification amount can be displayed at any time by setting the time.

2. A method for calculating the dehumidification capacity of a closed dryer, characterized in that: A closed drying machine as claimed in claim 1 and performing the following calculation steps: Collecting a first pressure P1 on the first pressure sensor (100), a second pressure P2 on the second pressure sensor (101), a temperature T1 on the first temperature sensor (201), a temperature T2 on the second temperature sensor (202), a temperature T3 on the third temperature sensor (203), a temperature T4 on the fourth temperature sensor (204), a temperature T5 on the fifth temperature sensor (205), and a temperature T6 on the sixth temperature sensor (206); The suction and exhaust enthalpy values ​​h1 and h2 of the compressor (1) are calculated from P1, T1 and P2, T2, and the suction specific volume is obtained. The refrigerant mass G is calculated according to the displacement of the compressor (1), and the power of the compressor (1) is obtained as P = (h2-h1)*G; The enthalpy value h3 at the outlet of condenser (2) is calculated from P1 and T3, and the heat exchange amount qc of condenser (2) is (h3-h1)*G; The air volume V of the condenser (2) is calculated from qc, T5, and T6, and V=qc / (T6-T5) / CP1, where CP1 is the constant pressure specific heat of the air in the condenser (2); The sensible heat qs of the evaporator (4) is calculated from V, T4, and T5, where qs=V*(T4-T5)*CP2, where CP2 is the constant-pressure specific heat of the air in the evaporator (4); Calculate the latent heat ql of the evaporator (4), then ql=qc-p-qs; Calculate the dehumidification capacity m of the evaporator (4), then m=ql / (2500+(T4-T5)*CPW), CPW is the constant pressure specific heat of water in the evaporator (4).

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