Electric valve

Abstract

The utility model relates to the technical field of electrically operated valves, in particular to an electrically operated valve with a reasonable structure. When an indoor unit and an outdoor unit are far away from each other, two electric valves and one-way valves are installed in order to give consideration to the refrigerating efficiency and the heating efficiency, and the risks of welding spots and refrigerant leakage are increased. A valve body is provided with a rotor, and the rotor inputs power; a screw rod and a nut are arranged in the rotor, and rotary motion is converted into spiral motion; a valve seat is arranged below the valve body, a large valve port is formed in the valve seat, a piston is arranged in the valve seat, a small valve port is formed in the piston, a valve element is arranged in the piston, and the screw rod drives the valve element to move up and down; the valve core is close to or far away from the small valve port, so that the area of the small valve port is changed, and the flow in the system is changed; when a refrigerant flows from the first connecting pipe to the second connecting pipe, the pressure of the large valve port is higher than that of the valve cavity A, and the large valve port communicates with the valve cavity A. The air conditioner is reasonable in structure, low in cost and convenient to adjust, refrigerant leakage is reduced, refrigerating and heating efficiency is considered, and two one-way valves and accessories are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric valves, and more specifically to an electric valve with a reasonable structure. Background Art

[0002] Electric valves are mainly used in cooling or heating systems. They are installed on outdoor or indoor units to throttle and reduce pressure. In many applications, when the indoor and outdoor units are far apart, if the electric valve is installed on the indoor or outdoor unit, only the operating efficiency of a certain cooling or heating condition can be optimized. For example, if the electric valve is installed on the outdoor unit, for cooling conditions, the outdoor unit is equivalent to a condenser, and the indoor unit is an evaporator. Since the electric valve is installed on the outdoor unit, the medium-temperature and high-pressure liquid formed after the condenser condenses enters the electric valve, and the electric valve throttles and reduces pressure to form a low-temperature and low-pressure liquid refrigerant. In addition, since the indoor and outdoor units are far apart, the low-temperature and low-pressure refrigerant will further reduce pressure and absorb heat in the pipeline, resulting in ineffective heat absorption and the generation of gaseous refrigerant. On the one hand, the indoor unit evaporator space is occupied by the gaseous refrigerant, and the gaseous refrigerant absorbs very little heat, the evaporator utilization rate decreases, and the system's energy efficiency ratio is reduced. However, it is very beneficial for heating conditions. In heating conditions, the indoor unit is equivalent to the condenser, and the outdoor unit is equivalent to the evaporator. Since the electric valve is close to the evaporator, less gaseous refrigerant is produced, which can improve the utilization efficiency of the evaporator. On the contrary, if the electric valve is installed on the indoor unit, the heating efficiency will decrease.

[0003] In order to solve this problem, two electric valves are installed in the system, and one-way valves are connected in parallel to the electric valves. The direction of the one-way valves is: the indoor unit one-way valve is installed in the direction that the indoor flow is connected to the outdoor, and the outdoor flow is closed to the indoor; the outdoor unit one-way valve is installed in the direction that the outdoor flow is connected to the indoor, and the indoor flow is closed to the outdoor; through the parallel one-way valves, during cooling, since the outdoor one-way valve is connected and the indoor one-way valve is closed, the outdoor electric valve cannot throttle and reduce the pressure, and the indoor electric valve throttles and reduces the pressure, which does not affect the cooling efficiency of the system; during heating, since the indoor one-way valve is connected and the outdoor guide valve is closed, the indoor electric valve cannot throttle and reduce the pressure, and the outdoor electric valve throttles and reduces the pressure, which does not affect the heating efficiency of the system. When the indoor unit and the outdoor unit are far apart, by installing two electric valves and connecting one-way valves in parallel, the cooling and heating efficiency are balanced.

[0004] In order to balance the efficiency of cooling and heating, two one-way valves are connected in parallel in the system, which makes the system pipeline complicated and increases the volume of the system. In particular, the increase in the volume of the indoor unit will also affect the appearance. At the same time, the number of welding points increases, increasing the risk of refrigerant leakage. The auxiliary pipelines and one-way valves also increase the cost of the system. Utility Model Content

[0005] The purpose of the utility model is to provide an electric valve with a reasonable structure in view of the deficiencies in the prior art.

[0006] An electric valve comprises a valve body, wherein the valve body is provided with a rotor, through which power is input; a matching screw rod and nut are provided in the rotor, which convert the rotary motion of the rotor into spiral motion; a valve seat is provided below the valve body, a large valve port is provided on the valve seat, a piston is provided in the valve seat, a small valve port is provided on the piston, a valve core is provided in the piston, and the screw rod drives the valve core to move up and down; a second connecting pipe and a first connecting pipe are installed on the valve seat, the second connecting pipe is connected with cavity A, and the first connecting pipe is connected with the large valve port; when the refrigerant flows from the second connecting pipe to the first connecting pipe, the valve core can approach or move away from the small valve port, change the area of ​​the small valve port, thereby changing the flow in the system, and performing flow regulation and throttling and pressure reduction; when the refrigerant flows from the first connecting pipe to the second connecting pipe, the valve core of the electric valve is fully opened, the pressure of the large valve port is higher than that of the valve cavity A, the piston is lifted away from the large valve port by the upward force, and the large valve port is connected with the valve cavity A.

[0007] The utility model has a reasonable structure, and because two one-way valves are reduced, the cost is relatively low, and the adjustment is convenient, the risk of refrigerant leakage is reduced, and the refrigeration and heating efficiencies are balanced.

[0008] As a further improvement and supplement to the above solution, the utility model also includes the following additional technical features:

[0009] The piston also includes a small valve port sealing surface, an outer sealing part, a flow hole, an inner guide part, an outer guide part and a piston positioning part. The structure is reasonable, the valve core is guided by the inner guide surface of the piston, and since the inner guide surface and the small valve port are on the same part and can be processed and formed at one time, the position accuracy of the inner guide and the small valve port is guaranteed, and the valve core is prevented from getting stuck when rotating or moving linearly.

[0010] A connecting seat is connected between the valve seat and the valve core, so that the piston can accurately fall into the large valve opening.

[0011] The connecting seat comprises a base, a connecting seat positioning part and a guide part, a step hole is arranged on the valve seat, and the base is sleeved in the step hole of the valve seat. The connecting seat guide part is a piston guide, so that the piston can accurately fall into the large valve port.

[0012] The diameter of the large valve port is greater than or equal to the inner diameter of the pipe, and the diameter of the large valve port is greater than 1.2 times and less than 1.4 times the diameter of the pipe. When the large valve port is greater than 1.2 times, it is beneficial to reduce the overall pressure loss of the electric valve and improve the system efficiency. When the large valve port is greater than 1.4 times, the pressure loss is mainly concentrated on the pipe, which is not conducive to the stability of the piston (the piston is prone to shaking).

[0013] The piston diameter D1, the piston sealing surface bottom diameter D2, and the large valve port diameter D3 should satisfy the following relationship: D1>D3>D2, preferably the difference between D1-D3 is between 0.1-0.5; the difference between D3-D2 is between 0.2-0.5. This ensures the sealing of the piston. If the value is too small, the piston sealing will be unstable. If the value is too large, the upward force on the piston will be reduced during reverse operation, and even a downward force may occur.

[0014] The head of the second connecting pipe is saddle-shaped, and the inner concave diameter of the saddle matches the outer diameter of the positioning part of the connecting seat. The structure is reasonable and the connection is stable and reliable. The insertion depth of the second connecting pipe is guaranteed, which not only ensures the reliability of the weld, but also ensures that the second connecting pipe is not inserted too deep into the valve cavity A, reduces the pressure drop at this part when the refrigerant flows in reverse (the first connecting pipe 7 flows to the second connecting pipe 8), and improves the efficiency of the reverse flow.

[0015] The piston is provided with a plurality of flow holes, and the total area of ​​the flow holes is greater than the area of ​​the small valve port. The plurality of flow holes, the total area of ​​the plurality of flow holes is greater than 2.5 times the flow area of ​​the small valve port, ensures that when the small valve port is fully opened, there will be no throttling and pressure reduction in the flow holes, and ensures that the flow capacity of the electric valve is maximized under the condition of the same caliber.

[0016] The following beneficial effects can be achieved by using the utility model: The utility model has a reasonable structure. Since two one-way valves are reduced, the cost is relatively low, and the adjustment is convenient, the risk of refrigerant leakage is reduced, and the cooling and heating efficiency are balanced. The valve core is guided by the inner guide surface of the piston. Since the inner guide surface and the small valve port are on the same part and can be processed and formed at one time, the position accuracy of the inner guide and the small valve port is guaranteed, and the valve core is prevented from getting stuck when rotating or moving linearly. The guide part of the connecting seat is a piston guide, so that the piston can accurately fall into the large valve port. Reduce the overall pressure loss of the electric valve and improve the system efficiency. Ensure the sealing of the piston and maximize the flow capacity of the electric valve under the condition of the same caliber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 It is a schematic structural view of the valve seat 3 and the connecting seat 4 in the utility model.

[0019] Figure 3 It is a schematic structural view of the piston 5 in the utility model. DETAILED DESCRIPTION

[0020] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-3 As shown, the utility model is an electric valve.

[0022] The electric valve described in this embodiment includes a valve body 1, including a valve body 1, wherein the valve body 1 is provided with a rotor 10, through which power is input; a matching screw rod 11 and a nut 9 are provided in the rotor 10, which convert the rotational motion of the rotor 10 into a spiral motion; a valve seat 3 is provided below the valve body 1, a large valve port 3a is provided on the valve seat 3, a piston 5 is provided in the valve seat 3, a small valve port 5a is provided on the piston 5, a valve core 6 is provided in the piston 5, and the screw rod 11 drives the valve core 6 to move up and down; a second pipe 8 is installed on the valve seat 3 The first connecting pipe 7 and the second connecting pipe 8 are connected with the cavity A, and the first connecting pipe 7 is connected with the large valve port 3a; when the refrigerant flows from the second connecting pipe 8 to the first connecting pipe 7, the valve core 6 can approach or move away from the small valve port 5a, changing the area of ​​the small valve port 5a, thereby changing the flow in the system, and performing flow regulation and throttling and pressure reduction; when the refrigerant flows from the first connecting pipe 7 to the second connecting pipe 8, the valve core of the electric valve is fully opened, the pressure of the large valve port 3a is higher than that of the valve cavity A, and the piston is lifted away from the large valve port by the upward force, and the large valve port 3a is connected with the valve cavity A. The electric valve, the outer periphery of the valve body 1 is provided with a stepper motor stator (not shown), and the rotor cooperates with the stator to form a stepper motor. When the stepper motor stator receives a driving signal, the stepper motor rotor starts to rotate, which is a prior art and will not be expanded here. The piston is limited by the bottom end face of the nut 9, and the piston stroke is less than the valve core stroke. The nut is used to limit the piston, and the piston is limited without adding parts, thereby simplifying the structure. At the same time, since the nut is made of plastic, the impact noise when the piston is fully opened is also reduced.

[0023] Furthermore, the piston 5 further comprises a small valve port sealing surface 5b, an outer sealing portion 5c, a flow hole 5e, an inner guide portion 5f, an outer guide portion 5d and a piston positioning portion 5h. The small valve port sealing surface 5b and the outer sealing portion 5c are arranged in a conical structure.

[0024] Furthermore, a connecting seat 4 is connected between the valve seat 3 and the valve core 6 .

[0025] Furthermore, the connection seat 4 includes a base 4a, a connection seat positioning portion 4b and a guide portion 4c. The valve seat 3 is provided with a step hole 3b, and the base 4a is sleeved in the step hole 3b of the valve seat. The connection seat base 4a is stepped, and the stepped base 4a is fixed in the valve seat step hole 3b. The connection seat guide portion 4c guides the piston 5 so that the piston 5 can accurately fall into the large valve port. The connection seat positioning portion 4b is used for positioning to ensure the coaxiality between the two parts.

[0026] Furthermore, the diameter of the large valve port 3a is greater than or equal to the inner diameter of the connecting pipe, and the preferred large valve port diameter is greater than 1.2 times and less than 1.4 times the connecting pipe diameter. When the refrigerant flows from connecting pipe 7 to connecting pipe 8, the pressure in chamber C is high and that in chamber A is low. At this time, the piston is acted upon by an upward force, and the piston is pushed away from the large valve port 3a. The large valve port is completely opened, and the diameter of the large valve port is greater than or equal to the inner diameter of connecting pipe D4. At this time, the flow capacity of the electric valve is close to the flow capacity of connecting pipe 7, and the valve body is conducted. The preferred large valve port diameter is greater than 1.2 times and less than 1.4 times the connecting pipe diameter. A large valve port greater than 1.2 times is beneficial to reducing the overall pressure loss of the electric valve and improving system efficiency.

[0027] Furthermore, the diameter D1 of the piston 5, the diameter D2 of the bottom end of the piston sealing surface, and the large valve port diameter D3 should satisfy the following relationship: D1>D3>D2, preferably the difference between D1 and D3 is between 0.1 and 0.5; the difference between D3 and D2 is between 0.2 and 0.5.

[0028] Furthermore, the head of the second connecting pipe 8 is saddle-shaped, and the inner concave diameter of the saddle matches the outer diameter of the connecting seat positioning portion 4b.

[0029] Furthermore, the piston 5 is provided with a flow hole 5e, and there are multiple flow holes 5e, which are arranged on an arc surface, and the total area of ​​the flow holes is larger than the area of ​​the small valve port 5a.

[0030] When this electric valve is used,

[0031] A movable piston 5 is also provided in the valve cavity A. When the refrigerant flows from the second connecting pipe 8 to the first connecting pipe 7, the cavity A is at high pressure, the valve port 3a is at low pressure, and the piston is pressed on the valve port 3a. The small valve port 5a as described above is provided on the piston, and only the small valve port can be connected between the large valve port and the cavity A (the valve core leaves the small valve port). Since the valve core 6 can approach or move away from the small valve port, the area of ​​the small valve port is changed, and the refrigerant flow from the second connecting pipe 8 to the first connecting pipe 7 will also change, thereby changing the flow in the system.

[0032] When the refrigerant flows from the first connecting pipe 7 to the second connecting pipe 8, the pressure of the large valve port 3a is higher than that of the valve cavity A, and the piston is subjected to an upward force. When the valve core 6 is fully opened, the piston 5 is pushed open by the pressure, and the piston leaves the large valve port 3a. The large valve port is connected to the valve cavity A. Since the diameter of the large valve port is much larger than that of the small valve port, the throttling and pressure-reducing effect of the electric valve is very weak at this time, and it is basically in a conducting state, which is equivalent to the conducting state of the one-way valve.

[0033] Installation direction of the indoor unit electric valve: the outlet of the indoor heat exchanger is connected to the first pipe 7 of the electric valve, and the extension pipeline of the outdoor heat exchanger is connected to the second pipe 8 (the first pipe 7 flows to the second pipe 8 and is connected, and the second pipe 8 flows to the first pipe 7 to adjust the flow); installation direction of the outdoor unit electric valve: the outlet of the outdoor heat exchanger is connected to the first pipe 7 of the electric valve, and the extension pipeline of the indoor heat exchanger is connected to the second pipe 8 (the first pipe 7 flows to the second pipe 8 and is connected, and the second pipe 8 flows to the first pipe 7 to adjust the flow). During cooling, the outdoor heat exchanger is high pressure and the indoor heat exchanger is low pressure. The refrigerant flow direction of the indoor electric valve is from the second pipe 8 to the first pipe 7, and the electric valve adjusts the flow; the refrigerant flow direction of the outdoor electric valve is from the first pipe 7 to the second pipe 8, and the electric valve is connected. The indoor unit heat exchanger is equivalent to the evaporator. Since the electric valve used for throttling and pressure reduction is close to the evaporator, it does not affect the cooling efficiency of the system. When heating, the outdoor heat exchanger is low pressure, the indoor heat exchanger is high pressure, the indoor electric valve refrigerant flow direction is from the first pipe 7 to the second pipe 8, the electric valve is turned on; the outdoor electric valve refrigerant flow direction is from the second pipe 8 to the first pipe 7, the electric valve adjusts the flow. The outdoor heat exchanger is equivalent to the evaporator. Since the electric valve used for throttling and reducing pressure is close to the evaporator, it does not affect the refrigeration efficiency of the system. When the indoor unit and the outdoor unit are far apart, since the electric valve has the function of adjusting the flow in the forward direction (the second pipe 8 flows to the first pipe 7) and the reverse direction (the first pipe 7 flows to the second pipe 8) is turned on, the cooling and heating efficiency are balanced.

[0034] When the refrigerant flows from the second connecting pipe 8 to the first connecting pipe 7, the pressure in chamber A is high and that in chamber C is low. At this time, the piston is subjected to a downward force, and the piston outer sealing portion 5c is in close contact with the sealing portion 3b of the large valve port of the valve seat, closing the large valve port. At this time, the valve core approaches or moves away from the small valve port 5a, changing the flow area of ​​the small valve port, thereby changing the flow size from the second connecting pipe 8 to the first connecting pipe 7. At 0 pulses, the valve core sealing surface 6a is in close contact with the sealing surface 5b of the small valve port, completely cutting off the flow from the second connecting pipe 8 to the first connecting pipe 7. As described above, when the refrigerant flows from the second connecting pipe 8 to the first connecting pipe 7, the refrigerant flows from chamber A through the flow hole 5e into chamber B, and then into chamber C through the small valve port. Chamber C is connected to the first connecting pipe 7. There are multiple flow holes 5e, and the sum of the flow areas of the multiple 5e is greater than 2.5 times the flow area of ​​the small valve port, ensuring that the small valve port is fully opened without throttling and pressure reduction in the flow hole 5e, ensuring that the flow capacity of the electric valve is maximized under the condition of the same caliber.

[0035] The above are preferred implementations of the present invention, which do not limit the protection scope of the present invention. Any modifications and improvements made by those skilled in the art based on the design ideas of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. An electric valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a rotor (10) through which power is input; a screw rod (11) and a nut (9) are provided in the rotor (10) to convert the rotational motion of the rotor (10) into a spiral motion; a valve seat (3) is provided below the valve body (1); a large valve port (3a) is provided on the valve seat (3); a piston (5) is provided in the valve seat (3); a small valve port (5a) is provided on the piston (5); a valve core (6) is provided in the piston (5); and the screw rod (11) drives the valve core (6) to move up and down; a second connecting pipe (8) and a first connecting pipe (7) are installed on the valve seat (3); the second connecting pipe (8) is connected to the cavity A, and the first connecting pipe (7) is connected to the large valve port (3a); When the refrigerant flows from the second connecting pipe (8) to the first connecting pipe (7), the valve core (6) can approach or move away from the small valve port (5a), thereby changing the area of ​​the small valve port (5a), thereby changing the flow rate in the system, and performing flow regulation and throttling and pressure reduction; When the refrigerant flows from the first connecting pipe (7) to the second connecting pipe (8), the valve core of the electric valve is fully opened, the pressure of the large valve port (3a) is higher than that of the valve chamber A, the piston is lifted away from the large valve port by the upward force, and the large valve port (3a) is connected to the valve chamber A.

2. The electric valve according to claim 1, characterized in that: The piston (5) further comprises a small valve port sealing surface (5b), an outer sealing portion (5c), a flow hole (5e), ​​an inner guide portion (5f), an outer guide portion (5d) and a piston positioning portion (5h).

3. The electric valve according to claim 1, characterized in that: A connecting seat (4) is connected between the valve seat (3) and the valve core (6).

4. The electric valve according to claim 3, characterized in that: The connecting seat (4) comprises a base (4a), a connecting seat positioning portion (4b) and a guide portion (4c); a step hole (3b) is provided on the valve seat (3); and the base (4a) is sleeved in the step hole (3b) of the valve seat.

5. The electric valve according to claim 1, characterized in that: The diameter of the large valve opening (3a) is greater than or equal to the inner diameter of the connecting pipe, and the diameter of the large valve opening is greater than 1.2 times and less than 1.4 times the diameter of the connecting pipe.

6. The electric valve according to claim 1, characterized in that: The diameter D1 of the piston (5), the diameter D2 of the bottom end of the piston sealing surface, and the diameter D3 of the large valve port should satisfy the following relationship: D1>D3>D2, preferably the difference between D1 and D3 is between 0.1 and 0.5; the difference between D3 and D2 is between 0.2 and 0.

5.

7. The electric valve according to any one of claims 1 to 6, characterized in that: The head of the second connecting pipe (8) is saddle-shaped, and the inner concave diameter of the saddle matches the outer diameter of the connecting seat positioning portion (4b).

8. The electric valve according to claim 2, characterized in that: The piston (5) is provided with a circulation hole (5e), ​​there are a plurality of circulation holes (5e), ​​and the total area of ​​the circulation holes is greater than the area of ​​the small valve port (5a).

Images