Two-position three-way electromagnetic valve

Abstract

The utility model discloses a two-position three-way electromagnetic valve which comprises a valve body B and a coil C. The valve body B is provided with a single-hole pole, a double-hole pole and a sleeve, a movable core iron is further arranged in the sleeve, the double-hole pole is provided with a first valve port and a second valve port, the core iron is provided with a fixed sealing block, the sealing block seals the first valve port on the double-hole pole, and the coil C is arranged on the coil. The first valve port is communicated with the second outlet 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 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. The structure is reasonable, flow maximization and the minimum pressure difference in the valve cavity can be achieved, the machining difficulty of products is lowered, 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, a low-temperature evaporator is used for ice making, and a 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 power on and off, so as to realize the switching of ice making or cold water function.

[0003] As shown in Figure 6 CN 101000109A provides a direct-acting three-way solenoid valve scheme, A valve port and B valve port are respectively arranged on the end cover and valve seat of the sleeve, a core iron that moves back and forth under the coordination of the return spring and the electromagnetic coil is arranged in the cavity between the 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 a spring is arranged on 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 to communicate the valve port corresponding to the sealing plug and the closed cavity. The structure can ensure that the elastic force of the spring supporting the sealing plug is fully applied to the sealing plug, without the need to design the spring to be larger in elasticity, so as to ensure that the sealing plug can effectively block the valve port and has a certain buffering capacity, obviously without the need to increase the power of the 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 set. The support surface is prone to be uneven, and the assembly is not convenient. In another scheme, two sealing blocks are provided with independent springs, and the structure is complex. The structure also has the following defects. Both sealing blocks are movably arranged, 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 provided 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 provided 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, increasing the stroke of the core iron necessarily requires increasing the ampere turns of the electromagnetic 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 cavity between the end cover 4 and the core iron 10 is low in pressure, and the cavity between the core iron 10 and the valve seat 7 is high in pressure. The upward pressure difference is greater than the spring force, and the core iron cannot be reset when the power is off. The scheme provided in the patent CN 101000109A also has the problems of high machining difficulty, low machining efficiency, and difficult control of surface finish of the small hole (generally 1 mm) which needs to be machined on the end cover 6. In view of the above problems, the following provides a solution. Content of the utility model

[0005] The utility model aims at the deficiencies 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 pipe and a second outlet pipe are arranged on the double hole pole, a first outlet 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, and the first valve port is communicated with the inlet 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 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 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 pipe and the second outlet pipe are communicated.

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

[0008] The core and the small valve seat are further provided with a spring. The spring has two functions: it returns the core when the coil is powered off and seals the double hole pole; and it presses the small valve seat in the inner hole of the single hole pole to maintain the size stability.

[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; the small platform seals the single pole hole when the coil C is powered on. The structure is reasonable and the sealing effect is good.

[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, and 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 structure is reasonable, the flow capacity of the balance channel assembly is close to that of the second valve port, and 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. The structure is reasonable, when the micro-leak refrigerant enters the gap, it is exhausted through the groove, preventing the accumulation of liquid from causing expansion and extruding the small valve seat.

[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-pole hole are close to each other, so that the flow is maximized and the pressure difference in the valve cavity is minimized. Also, 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, it has good elasticity and can be reliably sealed with the front end of the core iron. At the same time, the small hole on the rubber has low processing difficulty, which reduces the overall difficulty of the product.

[0016] The use of the utility model can achieve the following beneficial effects: the utility model structure is reasonable, the flow is maximized and the pressure difference in the valve cavity is minimized, the overall processing difficulty of the product is reduced, the action of the core iron is reliable, the balance channel is arranged to ensure that the core iron can be normally reset, and the flow can meet the expected requirement. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of an embodiment;

[0018] Figure 2 is a structural schematic diagram of the core iron in the embodiment.

[0019] Figure 3 is a structural schematic diagram of the single-pole hole in the embodiment;

[0020] Figure 4 is a structural schematic diagram of the small valve seat in the embodiment;

[0021] Figure 5 is a front view of the small valve seat in the embodiment.

[0022] Figure 6 is a structural schematic view of prior art in the background art.

[0023] Reference signs: 1, first outlet connector; 3, single-hole pole; 3a, central hole; 3b, first transition hole; 3c, stepped hole; 3h, limiting hole; 4, core iron; 4a, first balance channel; 4b, second balance channel; 4d, third balance channel; 4h, fourth balance channel; 4e, T-shaped hole; 4f, small platform; 6, spring; 8, small valve seat; 8a, second transition hole; 8b, single-pole hole; 8c, second circumferential segment; 8d, flat surface; 8e, annular groove; 8f, first circumferential segment; 8h, groove; 9, sealing block; 10, double-hole pole; 10a, first valve port; 10b, second valve port; 11, sleeve; 12, second outlet connector; 13, inlet connector; I, first cavity; II, second cavity. DETAILED DESCRIPTION

[0024] The specific embodiments of the utility model will be described in detail below with reference to the drawings.

[0025] As Figures 1-5 shown, the utility model discloses a two-position three-way solenoid valve, including valve body B and coil C, coil C is sleeved on the outer periphery of valve body B, and valve body B is provided with single-hole pole 3, double-hole pole 10 and sleeve 11, and double-hole pole 10 and single-hole pole 3 are all fixed on sleeve 11.

[0026] Double-hole pole 10 is provided with inlet connector 12 and second outlet connector 13, and single-hole pole 3 is provided with first outlet connector 1.

[0027] Sleeve 11 is also provided with movable core iron 4, and double-hole pole 10 is provided with first valve port 10a and second valve port 10b, and second valve port 10b is communicated with second outlet connector 13.

[0028] Single-hole pole 3 is installed with small valve seat 8, and small valve seat 8 is provided with single-pole hole 8b, and single-pole hole 8b is communicated with first outlet connector 1 through second transition hole 8a and first transition hole 3b on single-hole pole 3.

[0029] When coil C is powered off, core iron 4 is separated from single-hole pole 3, sealing block 9 closes first valve port 10a, and inlet pipe 13 is communicated with first outlet pipe 1, and when coil C is powered on, core iron 4 is attracted to single-hole pole 3, and inlet connector 12 and second outlet connector 13 are communicated.

[0030] Because the small hole on the single pole hole does not need to be processed, the processing difficulty of the single pole hole is reduced, and because the small valve seat 8 can be formed of rubber material, the processing difficulty of the small hole on the rubber is low, and the overall difficulty of the product is reduced.

[0031] The spring 6 is further arranged between the core iron 4 and the small valve seat 8. The spring 6 has two functions. When the coil is powered off, the core iron 4 is restored to seal the double hole pole 10. The other function is to press the small valve seat 8 in the inner hole of the single hole pole 3, so that the size remains stable.

[0032] The core iron 4 is provided with a small platform 4f close to one end of the single pole hole 3. 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. The outer dimension of the small platform 4f is smaller than other outer dimensions, and the suction force is relatively small. When the coil is powered on, the single hole pole 3 is attracted to the core iron 4, and the small platform 4f seals the single pole hole 8b. Because the small valve seat 8 is made of rubber material, it has good elasticity and can reliably seal the front end of the core iron 4.

[0033] 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. Φd2>Φd1>Φd3, the limiting hole 3h is provided with a first press-in angle, which facilitates the press-in of the small valve seat 8; 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 small valve seat 8 can be easily inserted into the center hole 3a of the single hole 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, and the limiting hole 3h protrudes and recesses to engage the annular groove 8e, thereby clamping 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, which has a larger diameter than the single pole hole 8b. Because 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.

[0034] The double hole pole 10 and the core iron 4 form a second cavity II, and the single hole pole 3 and the core iron 4 form a first cavity I. A balance channel assembly is further arranged on the core iron 4. 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 open 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.

[0035] The flow capacity of the balance channel is close to the flow capacity of the second valve port 10b, so that the flow of the first outlet pipe 1 can meet the expected requirements. When the coil is switched from being powered on to being powered off, if there is no balance channel or the balance capacity is insufficient, the pressure in the first cavity I can be lower than the pressure in the second cavity II during the resetting of the core iron 4, so that the pressure difference generates an additional force on the core iron that is greater than the restoring force of the spring, causing the core iron to fail to reset normally. At this time, both the double-hole pole and the single-hole pole are prone to half-opening. The balance channel assembly is provided to ensure that the core iron can reset normally.

[0036] The small valve seat 8 is further provided with a groove 8h at the lower end, which communicates the gap between the small valve seat 8 and the single-hole pole 3. In this embodiment, the groove 8h is a groove recessed inwardly from the lower end plane of the small valve seat 8, and penetrates the entire plane.

[0037] 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 relatively low hardness. The front end of the T-shaped hole 4e has a second press-in angle, which facilitates the installation of the sealing block into the core iron 4.

[0038] The first valve port 10a, the second valve port 10b and the single-pole hole 8b have diameters close to each other, so as to maximize the flow and minimize the pressure difference in the valve cavity.

[0039] The sealing block 9 and the small valve seat 8 are made of rubber material.

[0040] 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-hole pole 3, the sealing block 9 closes the first valve port 10a, and the inlet pipe 13 is in communication 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 pipe 12 and the second outlet pipe 13 are in communication. Two communication modes are formed.

[0041] The above is the preferred embodiment of the present application, which does not limit the protection scope of the present application. Any deformation and improvement made by those skilled in the art according to the design idea of the present application should be considered within the protection scope of the present application.

Claims

1. A two-position three-way electromagnetic valve comprising a valve body B and a coil C, the coil C being sleeved on the outer periphery of the valve body B, a single-hole pole (3), a double-hole pole (10) and a sleeve (11) being arranged on the valve body B, the double-hole pole (10) and the single-hole pole (3) being fixed on the sleeve (11); an inlet connecting pipe (13) and a second outlet connecting pipe (12) being arranged on the double-hole pole (10), a first outlet connecting pipe (1) being arranged on the single-hole pole (3), 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 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 the second transition hole (8a) and the first transition hole (3b) on the single-hole pole (3) in sequence.

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

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 (8b), the upper end surface of the small valve seat (8) is a plane (8d), and the small platform (4f) is used for controlling the plugging state of 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 and a center hole (3a) with a diameter of Φd2, a limiting hole (3h) with a diameter of Φd3 is arranged 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; the outer periphery of the small valve seat (8) has an annular groove (8e), the annular groove (8e) 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 convex-concave clamped with the annular groove (8e), so that the small valve seat (8) is clamped in the single-hole pole (3); the other side of the single-pole hole (8b) is provided with a second transition hole (8a), and the diameter of the second transition hole (8a) is greater 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 comprises a first balance channel (4a), a second balance channel (4b), a third balance channel (4d) and a fourth balance channel (4h), and the balance channel assembly is used for communicating the first cavity (I) and the second cavity (II).

6. The two-position, three-way solenoid valve of claim 1, wherein: The lower end of the small valve seat (8) is further provided with a groove (8h), and the groove (8h) 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) and is fixedly matched with the T-shaped hole (4e), and the front end of the T-shaped hole (4e) has a second press-in angle.

8. The two-position, three-way solenoid valve of claim 1, wherein: The diameters of the first valve port (10a), the second valve port (10b) and the single-pole hole (8b) are equal, so as to realize maximum flow and minimum pressure difference in the valve cavity.

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