Two-position three-way electromagnetic valve

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a two-position three-way electromagnetic valve. In the prior art, small holes need to be machined in the end socket, the machining difficulty is high, the machining efficiency is low, and the surface smoothness is difficult to control. According to the two-position three-way electromagnetic valve, a movable core iron is further arranged in a sleeve, a first valve port and a second valve port are formed in a double-hole pole, a fixed sealing block is arranged on the core iron, the first valve port and the second valve port in the double-hole pole are sealed by the sealing block, and the sealing block is communicated with an inlet connecting pipe; a small valve seat is mounted on the single-hole pole, a single-pole hole is formed in the small valve seat, and the single-pole hole is communicated with a first outlet connecting pipe through a second transition hole and a first transition hole; the coil C is powered off, the core iron is separated from the single-hole pole, the sealing block closes the first valve port, and the inlet connecting pipe is communicated with the first outlet pipe; the coil C is electrified, the core iron is attracted with the single-hole pole, and the inlet connecting pipe is communicated with the second outlet connecting pipe. According to the utility model, the structure is reasonable, the flow maximization and the minimum pressure difference in the valve cavity can be realized, the processing difficulty of the product is reduced, and the core iron acts reliably.

Description

TECHNICAL FIELD

[0001] The utility model relates to solenoid valve technical field, more specifically relates to a two-position three-way solenoid valve. BACKGROUND

[0002] Two-position three-way solenoid valve is mainly used in the occasion that two branches need to be controlled in system, such as refrigerator cold storage room and freezer room, multifunctional ice maker ice making and cold water, two-position three-way solenoid valve can easily realize the control of the above system. Multifunctional ice maker has two evaporators, one low-temperature evaporator is used for ice making, and the medium-temperature evaporator is used for cold water, generally, both do not need to work simultaneously, the high-pressure medium-temperature liquid refrigerant from the condenser enters the solenoid valve from the inlet pipe of two-position three-way solenoid valve, and the flow of medium-temperature evaporator and low-temperature evaporator refrigerant is switched by on-off power, so as to realize the switching of ice making or cold water function.

[0003] As Figure 6 CN101000109A provides a direct-acting three-way solenoid valve scheme, A valve port and B valve port are arranged on the end cover and valve seat of sleeve respectively, a core iron that moves back and forth under the coordination of return spring and electromagnetic coil is arranged in the cavity between two valve ports, so as to selectively close the two valve ports by the sealing plug on the core iron, so that the other open valve port communicates with the outlet arranged on the valve seat, and the spring is supported at the rear of the sealing plug; its feature is that at least one closed cavity is arranged at the rear of one sealing plug, and a channel is arranged on the sealing plug, which communicates the valve port corresponding to the sealing plug and the closed cavity. The structure can guarantee that the elastic force of the spring supporting the sealing plug is all applied to the sealing plug, without the need to design the elasticity of the spring to be larger, so as to guarantee that the sealing plug can effectively block the valve port, and has certain buffering capacity, obviously, without the need to increase the power of electromagnetic coil.

[0004] The patent CN 101000109A provides multiple schemes for the spring arranged between the sealing blocks. In one scheme, two sealing blocks share one spring, and the support surface at the other end of the spring is difficult to arrange. The support surface is prone to be uneven, and the assembly is not convenient. In another scheme, two sealing blocks are arranged with independent springs, and the structure is complex. The structure has the following defects. Both sealing blocks are arranged movably, and the core iron positioning is adopted for both power-off and power-on of the coil. In order to reliably seal the sealing blocks and the valve port, a sealing allowance must be arranged between the sealing blocks and the core iron. The sealing allowance must be greater than the cumulative tolerance of the related parts, otherwise the sealing blocks cannot be reliably closed. In order to ensure the flow capacity of the sealing blocks after full opening, a reasonable distance must be arranged between the sealing blocks and the valve port during full opening. The reasonable distance and the two sealing allowances form the stroke of the core iron. The two sealing allowances necessarily increase the stroke of the core iron. In the case that the DC current is sensitive to the stroke of the core iron, the increase of the stroke of the core iron necessarily requires the increase of the ampere turns of the coil, which causes the problems of high cost and large volume of the coil. Meanwhile, in the patent CN 101000109A, the balance passage of the cavity between the end cover 4 and the core iron 10 and the cavity between the core iron 10 and the valve seat 7 is insufficient. Especially during the process that the end cover 3 is attracted to the core iron 10 and then is released, the low pressure of the cavity between the end cover 4 and the core iron 10 and the high pressure of the cavity between the core iron 10 and the valve seat 7 are caused. The upward pressure difference is greater than the spring force, and the core iron cannot be reset during power-off. The scheme provided in the patent CN 101000109A also has the problems that a small hole (generally 1mm) needs to be machined on the end cover 6. The machining is difficult, the machining efficiency is low, and the surface finish is difficult to control. Content of the utility model

[0005] The utility model aims at the defects of the prior art, and provides a two-position three-way electromagnetic valve which reduces the difficulty of the whole product and the reliability of the core iron action.

[0006] A two-position three-way electromagnetic valve, comprising a valve body B and a coil C, the coil C is sleeved on the outer periphery of the valve body B, a single hole pole, a double hole pole and a sleeve are arranged on the valve body B, and the double hole pole and the single hole pole are fixed on the sleeve; an inlet connecting pipe and a second outlet connecting pipe are arranged on the double hole pole, a first outlet connecting pipe is arranged on the single hole pole, a movable core is further arranged in the sleeve, a first valve port and a second valve port are arranged on the double hole pole, a fixed sealing block is arranged on the core close to one end of the double hole pole, the sealing block seals the first valve port on the double hole pole, the first valve port is communicated with the second outlet connecting pipe, and the second valve port is communicated with the inlet connecting pipe; a small valve seat is arranged on the single hole pole, a single pole hole is arranged on the small valve seat, the single pole hole is communicated with the first outlet connecting pipe through a second transition hole and a first transition hole on the single hole pole; when the coil C is powered off, the core is separated from the single hole pole, the sealing block closes the first valve port, and the inlet connecting pipe is communicated with the first outlet pipe; when the coil C is powered on, the core is attracted to the single hole pole, and the inlet connecting pipe and the second outlet connecting pipe are communicated.

[0007] As further improvement and supplement to the above scheme, the utility model further includes the following additional technical features:

[0008] The spring has two effects, one is to return the core and seal the double hole pole when the coil is powered off, and the other is to press the small valve seat in the single hole pole to keep the size stable.

[0009] The core is provided with a small platform close to one end of the single pole hole, and the upper end surface of the small valve seat is a plane, so that the small platform seals the single pole hole when the coil C is powered on.

[0010] The single hole pole is provided with a stepped hole with a diameter of Φd1, a center hole with a diameter of Φd2, and a limiting hole with a diameter of Φd3 between the center hole and the stepped hole, and Φd2>Φd1>Φd3, the limiting hole is provided with a first pressing angle; the outer periphery of the small valve seat has an annular groove, which divides the outer periphery of the small valve seat into a first circumferential segment and a second circumferential segment, the first circumferential segment is in interference fit with the stepped hole, and the second circumferential segment is in clearance fit with the center hole; the limiting hole protrudes and recesses to engage the annular groove, so that the small valve seat is clamped in the single hole pole; the other side of the single pole hole is provided with a second transition hole, and the diameter of the second transition hole is larger than that of the single pole hole. The small valve seat is fixed stably and reliably, and since the second transition hole can be designed to be relatively large, the shrinkage deformation after interference pressing will not affect the flow capacity of the valve port.

[0011] The second cavity is formed between the double-hole pole and the core iron, the first cavity is formed between the single-hole pole and the core iron, and the balance channel assembly is arranged on the core iron and comprises a first balance channel, a second balance channel, a third balance channel and a fourth balance channel, the balance channel assembly is used for communicating the first cavity and the second cavity, when the coil C is powered off, the refrigerant enters the second cavity through the inlet pipe, enters the first cavity through the balance channel assembly, and then enters the first outlet pipe through the center hole. The balance channel assembly has a flow capacity close to that of the second valve port, so that the flow of the first outlet pipe can meet the expected requirement.

[0012] The lower end of the small valve seat is further provided with a groove, and the groove communicates the gap between the small valve seat and the single-hole pole. When the micro-leak refrigerant enters the gap, the groove can drain the micro-leak refrigerant, so that the accumulation of the micro-leak refrigerant is prevented, and the small valve seat is prevented from being extruded.

[0013] The core iron is provided with a T-shaped hole, and the sealing block is inserted into the T-shaped hole to form a fixed fit with a small gap, and the front end of the T-shaped hole has a second pressing angle. The structure is reasonable, and the installation and fixation are stable and reliable.

[0014] The diameters of the first valve port, the second valve port and the single-hole pole are close to each other, so that the flow is maximized and the pressure difference in the valve cavity is minimized. In addition, the sealing area of the sealing block is minimized, and the action reliability of the core iron is improved.

[0015] The sealing block and the small valve seat are made of rubber material. Since the small valve seat is made of rubber material, the small valve seat has good elasticity and can be reliably sealed with the front end of the core iron. In addition, the small hole on the rubber material has low processing difficulty, and the overall processing difficulty of the product is reduced.

[0016] The utility model discloses the following beneficial effects can be achieved: the utility model structure is reasonable, can realize flow maximization and valve cavity internal pressure difference minimum, the overall processing difficulty of product is reduced, the action of core iron is reliable, sets up balance channel, guarantees that core iron can normally reset, and flow can reach the expected requirement. BRIEF DESCRIPTION OF DRAWINGS

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

[0018] Figure 2 It is the structure schematic diagram of the core iron 4 in the utility model.

[0019] Figure 3 It is the structure schematic diagram of the single-hole pole 3 in the utility model.

[0020] Figure 4 It is the structure schematic diagram of the small valve seat 8 in the utility model.

[0021] Figure 5This is the front view of the small valve seat 8 in this utility model.

[0022] Figure 6 This is a schematic diagram of the existing technology. Detailed Implementation

[0023] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] like Figures 1-5 As shown, this utility model is a two-position three-way solenoid valve.

[0025] The two-position three-way solenoid valve described in this embodiment includes a valve body B and a coil C. The coil C is sleeved on the outer periphery of the valve body B. The valve body B is provided with a single-hole pole 3, a double-hole pole 10, and a sleeve 11. The double-hole pole 10 and the single-hole pole 3 are both fixed on the sleeve 11. The double-hole pole 10 is provided with an inlet pipe 13 and a second outlet pipe 12. The single-hole pole 3 is provided with a first outlet pipe 1. The sleeve 11 is also provided with a movable core iron 4. The double-hole pole 10 is provided with a first valve port 10a and a second valve port 10b. The second valve port 10b is connected to the inlet pipe 13. A fixed sealing block 9 is provided on the core iron 4 near one end of the double-hole pole 10. The sealing block 9 seals the first valve port 10a on the double-hole pole, and the first valve port 10a is connected to the second outlet pipe 12. A small valve seat 8 is installed on the single-hole pole 3. The small valve seat 8 is provided with a single-pole hole 8b. The single-pole hole 8b is connected to the first outlet pipe 1 through the second transition hole 8a and the first transition hole 3b on the single-hole pole 3. When the coil C is de-energized, the core iron 4 is disengaged from the single-hole pole 3, the sealing block 9 closes the first valve port 10a, and the inlet pipe 13 is connected to the first outlet pipe 1. When the coil C is energized, the core iron 4 is attracted to the single-hole pole 3, and the inlet pipe 13 and the second outlet pipe 12 are connected. Since it is not necessary to process small holes on the single-pole holes, the processing difficulty of the single-pole holes is reduced. Furthermore, since the small valve seat 8 can be molded from rubber material, the processing difficulty of small holes on rubber is low, which reduces the overall complexity of the product.

[0026] Furthermore, a spring 6 is provided between the core iron 4 and the small valve seat 8. The spring 6 has two functions: when the coil is de-energized, it returns the core iron 4 to its original position, sealing the double-hole pole 10; the other function is to press the small valve seat 8 into the inner hole of the single-hole pole 3, so as to maintain dimensional stability.

[0027] Furthermore, a small platform 4f is provided at the end of the core iron 4 near the single-pole hole 3, and the upper surface of the small valve seat 8 is a plane 8d. When the coil C is energized, the small platform 4f seals the single-pole hole 8b. The outer dimensions of the small platform 4f are smaller than other outer dimensions, resulting in a relatively small attraction force. When the coil is energized, the single-hole pole 3 attracts the core iron 4, and the small platform 4f seals the single-pole hole 8b. Since the small valve seat 8 is made of rubber, it has good elasticity and can reliably seal with the front end of the core iron 4.

[0028] Further, the single-pole 3 is provided with a stepped hole 3c with a diameter of Φd1, a center hole 3a with a diameter of Φd2, and a limiting hole 3h with a diameter of Φd3 between the center hole 3a and the stepped hole 3c, Φd2>Φd1>Φd3, the limiting hole 3h is provided with a first press-in angle, facilitating the press-in of the small valve seat 8; the outer periphery of the small valve seat 8 has an annular groove 8e, dividing the outer periphery of the small valve seat 8 into a first circumferential segment 8f and a second circumferential segment 8c, the small valve seat 8 can be easily inserted into the center hole 3a of the single-pole 3, the first circumferential segment 8f is in interference fit with the stepped hole 3c, and the second circumferential segment 8c is in clearance fit with the center hole 3a; the limiting hole 3h is protrudingly embedded, the limiting hole 3h protrudes and recesses to engage the annular groove 8e, clamping the small valve seat 8 in the single-pole 3; the other side of the single-pole hole 8b is provided with a second transition hole 8a with a diameter larger than that of the single-pole hole 8b. Since the second transition hole 8a can be designed to be relatively large, the shrinkage deformation after interference press-fitting will not affect the flow capacity of the valve port.

[0029] Further, the double-pole 10 and the core iron 4 form a second cavity II, the single-pole 3 and the core iron 4 form a first cavity I, and the core iron 4 is further provided with a balance channel assembly, the balance channel assembly includes a first balance channel 4a, a second balance channel 4b, a third balance channel 4d, and a fourth balance channel 4h, the first balance channel 4a and the fourth balance channel 4h are in the same direction, and are through channels leading to the outside, the second balance channel 4b and the third balance channel 4d are channels consistent with the main direction of the core iron 4, one is arranged at the center position, and the other is arranged on the circumference. The first cavity I and the second cavity II are communicated with the balance channel assembly, when the coil C is powered off, the refrigerant enters the second cavity II through the second valve port 10b, then enters the first cavity I through the balance channel assembly, and then enters the first outlet pipe 1 through the center hole 3a.

[0030] The flow capacity of the balance channel is close to that of the second valve port 10b, ensuring that the flow of the first outlet pipe 1 can meet the expected requirements. When the coil switches from power-on to power-off, if there is no balance channel or the balance capacity is insufficient, the pressure in the first cavity I may be lower than that in the second cavity II during the core iron 4 reset process, resulting in an additional force on the core iron due to the pressure difference being greater than the restoring force of the spring, causing the core iron to fail to reset normally. At this time, both the double-pole and the single-pole are prone to half-open phenomenon. The balance channel assembly is provided to ensure that the core iron can reset normally.

[0031] Further, the lower end of the small valve seat 8 is further provided with a groove 8h, which communicates the gap between the small valve seat 8 and the single-pole 3. In this embodiment, the groove 8h is a groove recessed inward from the lower end plane of the small valve seat 8, and penetrates the entire plane.

[0032] Further, the core iron 4 is provided with a T-shaped hole 4e, and the sealing block 9 is also slightly T-shaped, the sealing block 9 is inserted into the T-shaped hole 4e to form a fixed fit with only a small gap, the sealing block 9 is generally made of rubber material and has a relatively low hardness, and the front end of the T-shaped hole 4e is provided with a second pressing-in angle to facilitate the sealing block to be installed into the core iron 4.

[0033] Further, the first valve port 10a, the second valve port 10b and the single-pole hole 8b are close to equal in diameter to realize maximum flow and minimum pressure difference in the valve cavity.

[0034] Further, the sealing block 9 and the small valve seat 8 are made of rubber material.

[0035] When the two-position three-way electromagnetic valve is used, when the coil C is powered off, the core iron 4 is separated from the single-pole 3, the sealing block 9 closes the first valve port 10a, and the inlet pipe 13 is in conduction with the first outlet pipe 1; when the coil C is powered on, the core iron 4 is attracted to the single-pole 3, and the inlet pipe 13 and the second outlet pipe 12 are in conduction, thereby forming two conduction modes.

[0036] The above is the preferred embodiment of the utility model, and does not limit the protection scope of the utility model, and the deformation and improvement made by the person skilled in the art according to the design idea of the utility model should be regarded as being within the protection scope of the utility model.

Claims

1. A two-position three-way solenoid valve, comprising a valve body B and a coil C, the coil C being sleeved on the outer periphery of the valve body B, wherein the valve body B is provided with a single-hole pole (3), a double-hole pole (10), and a sleeve (11), wherein the double-hole pole (10) and the single-hole pole (3) are both fixed on the sleeve (11); wherein the double-hole pole (10) is provided with an inlet pipe (13) and a second outlet pipe (12), and the single-hole pole (3) is provided with a first outlet pipe (1), characterized in that: The sleeve (11) is further provided with a movable core iron (4), the double-hole pole (10) is provided with a first valve port (10a) and a second valve port (10b), the core iron (4) near one end of the double-hole pole (10) is provided with a fixed sealing block (9), the sealing block (9) seals the first valve port (10a) on the double-hole pole, the first valve port (10a) is communicated with the second outlet connecting pipe (12), the second valve port (10b) is communicated with the inlet connecting pipe (13); the single-hole pole (3) is provided with a small valve seat (8), the small valve seat (8) is provided with a single-pole hole (8b), the single-pole hole (8b) is communicated with the first outlet connecting pipe (1) through a second transition hole (8a) and a first transition hole (3b) on the single-hole pole (3); when the coil C is powered off, the core iron (4) is separated from the single-hole pole (3), the sealing block (9) closes the first valve port (10a), and the inlet connecting pipe (13) is communicated with the first outlet pipe (1); when the coil C is powered on, the core iron (4) is attracted to the single-hole pole (3), and the inlet connecting pipe (13) and the second outlet connecting pipe (12) are communicated.

2. The two-position three-way solenoid valve of claim 1, wherein: The core iron (4) and the small valve seat (8) are further provided with a spring (6).

3. The two-position, three-way solenoid valve of claim 1, wherein: The core iron (4) is provided with a small platform (4f) near one end of the single-pole hole (3), and the upper end surface of the small valve seat (8) is a plane (8d); when the coil C is powered on, the small platform (4f) seals the single-pole hole (8b).

4. The two-position, three-way solenoid valve of claim 1, wherein: The single-hole pole (3) is provided with a stepped hole (3c) with a diameter of Φd1, a center hole (3a) with a diameter of Φd2, and a limiting hole (3h) with a diameter of Φd3 between the center hole (3a) and the stepped hole (3c), and Φd2>Φd1>Φd3; the limiting hole (3h) is provided with a first press-in angle; the outer periphery of the small valve seat (8) has an annular groove (8e), which divides the outer periphery of the small valve seat (8) into a first circumferential segment (8f) and a second circumferential segment (8c); the first circumferential segment (8f) is in interference fit with the stepped hole (3c), and the second circumferential segment (8c) is in clearance fit with the center hole (3a); the limiting hole (3h) is engaged with the annular groove (8e) to clamp the small valve seat (8) in the single-hole pole (3); the other side of the single-pole hole (8b) is provided with a second transition hole (8a) with a diameter larger than that of the single-pole hole (8b).

5. The two-position, three-way solenoid valve of claim 4, wherein: The double-hole pole (10) and the core iron (4) form a second cavity (II), the single-hole pole (3) and the core iron (4) form a first cavity (I), and the core iron (4) is further provided with a balance channel assembly, the balance channel assembly includes a first balance channel (4a), a second balance channel (4b), a third balance channel (4d) and a fourth balance channel (4h), the balance channel assembly is used for communicating the first cavity (I) and the second cavity (II), when the coil C is powered off, the refrigerant enters the second cavity (II) through the second valve port (10b) from the inlet pipe (13), then enters the first cavity (I) through the balance channel assembly, and then enters the first outlet pipe (1) through the center hole (3a).

6. The two-position, three-way solenoid valve of claim 1, wherein: The small valve seat (8) lower end is further provided with a groove (8h), which communicates the gap between the small valve seat (8) and the single hole pole (3).

7. The two-position, three-way solenoid valve of claim 1, wherein: The core iron (4) is provided with a T-shaped hole (4e), the sealing block (9) is inserted into the T-shaped hole (4e) to form a fixed fit with only a small gap, and the front end of the T-shaped hole (4e) has a second pressing angle.

8. The two-position, three-way solenoid valve of claim 1, wherein: The first valve port (10a), the second valve port (10b) and the single pole hole (8b) are close in diameter, so that the flow is maximized and the pressure difference in the valve cavity is minimized.

9. The two-position, three-way solenoid valve of claim 1, wherein: The sealing block (9) and the small valve seat (8) are made of rubber material.

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